diff --git a/.tx/config b/.tx/config
index fa5255f4..309d2750 100644
--- a/.tx/config
+++ b/.tx/config
@@ -124,6 +124,11 @@ source_file = plugins/tasklist/helpdocs/po/overview.pot
 source_lang = en_US
 type = PO
 
+[kolab.libkolab]
+file_filter = plugins/libkolab/localization/<lang>.inc
+source_file = plugins/libkolab/localization/en_US.inc
+source_lang = en_US
+
 [kolab.libcalendaring]
 file_filter = plugins/libcalendaring/localization/<lang>.inc
 source_file = plugins/libcalendaring/localization/en_US.inc
diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
index d4f9a199..0cd273a4 100644
--- a/plugins/calendar/drivers/kolab/kolab_driver.php
+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
@@ -71,8 +71,7 @@ class kolab_driver extends calendar_driver
     }
 
     // get configuration for the Bonnie API
-    if ($bonnie_config = $this->cal->rc->config->get('kolab_bonnie_api', false))
-      $this->bonnie_api = new kolab_bonnie_api($bonnie_config);
+    $this->bonnie_api = libkolab::get_bonnie_api();
 
     // calendar uses fully encoded identifiers
     kolab_storage::$encode_ids = true;
diff --git a/plugins/calendar/localization/en_US.inc b/plugins/calendar/localization/en_US.inc
index d967fc72..2a5d2359 100644
--- a/plugins/calendar/localization/en_US.inc
+++ b/plugins/calendar/localization/en_US.inc
@@ -278,15 +278,6 @@ $labels['birthdayage'] = 'Age $age';
 // history dialog
 $labels['objectchangelog'] = 'Change History';
 $labels['objectdiff'] = 'Changes from $rev1 to $rev2';
-$labels['revision'] = 'Revision';
-$labels['user'] = 'User';
-$labels['operation'] = 'Action';
-$labels['actionappend'] = 'Saved';
-$labels['actionmove'] = 'Moved';
-$labels['actiondelete'] = 'Deleted';
-$labels['compare'] = 'Compare';
-$labels['showrevision'] = 'Show this version';
-$labels['restore'] = 'Restore this version';
 $labels['objectnotfound'] = 'Failed to load event data';
 $labels['objectchangelognotavailable'] = 'Change history is not available for this event';
 $labels['objectdiffnotavailable'] = 'No comparison possible for the selected revisions';
diff --git a/plugins/calendar/skins/larry/templates/calendar.html b/plugins/calendar/skins/larry/templates/calendar.html
index 8d8e0105..8dc779d5 100644
--- a/plugins/calendar/skins/larry/templates/calendar.html
+++ b/plugins/calendar/skins/larry/templates/calendar.html
@@ -335,8 +335,8 @@
 </div>
 
 <div id="eventhistory" class="uidialog" aria-hidden="true">
-    <roundcube:object name="plugin.object_changelog_table" id="event-changelog-table" class="records-table changelog-table" domain="calendar" />
-    <div class="compare-button"><input type="button" class="button" value="↳ <roundcube:label name='calendar.compare' />" /></div>
+    <roundcube:object name="plugin.object_changelog_table" id="event-changelog-table" class="records-table changelog-table" />
+    <div class="compare-button"><input type="button" class="button" value="↳ <roundcube:label name='libkolab.compare' />" /></div>
 </div>
 
 <div id="calendarform" class="uidialog" aria-hidden="true">
diff --git a/plugins/kolab_addressbook/kolab_addressbook.php b/plugins/kolab_addressbook/kolab_addressbook.php
index 93215e40..7dd23e2c 100644
--- a/plugins/kolab_addressbook/kolab_addressbook.php
+++ b/plugins/kolab_addressbook/kolab_addressbook.php
@@ -77,9 +77,7 @@ class kolab_addressbook extends rcube_plugin
             $this->register_action('plugin.contact-restore', array($this, 'contact_restore'));
 
             // get configuration for the Bonnie API
-            if ($bonnie_config = $this->rc->config->get('kolab_bonnie_api', false)) {
-                $this->bonnie_api = new kolab_bonnie_api($bonnie_config);
-            }
+            $this->bonnie_api = libkolab::get_bonnie_api();
 
             // Load UI elements
             if ($this->api->output->type == 'html') {
@@ -547,12 +545,13 @@ class kolab_addressbook extends rcube_plugin
         $result = $uid && $mailbox ? $this->bonnie_api->changelog('contact', $uid, $mailbox, $msguid) : null;
         if (is_array($result) && $result['uid'] == $uid) {
             if (is_array($result['changes'])) {
+                $rcmail = $this->rc;
                 $dtformat = $this->rc->config->get('date_format') . ' ' . $this->rc->config->get('time_format');
-                array_walk($result['changes'], function(&$change) use ($dtformat) {
+                array_walk($result['changes'], function(&$change) use ($rcmail, $dtformat) {
                   if ($change['date']) {
                       $dt = rcube_utils::anytodatetime($change['date']);
                       if ($dt instanceof DateTime) {
-                          $change['date'] = $this->rc->format_date($dt, $dtformat);
+                          $change['date'] = $rcmail->format_date($dt, $dtformat);
                       }
                   }
                 });
diff --git a/plugins/kolab_addressbook/lib/kolab_addressbook_ui.php b/plugins/kolab_addressbook/lib/kolab_addressbook_ui.php
index 55fa6dd6..38ce9456 100644
--- a/plugins/kolab_addressbook/lib/kolab_addressbook_ui.php
+++ b/plugins/kolab_addressbook/lib/kolab_addressbook_ui.php
@@ -113,17 +113,11 @@ class kolab_addressbook_ui
 
                 $this->rc->output->add_label(
                     'kolab_addressbook.showhistory',
-                    'kolab_addressbook.compare',
                     'kolab_addressbook.objectchangelog',
                     'kolab_addressbook.objectdiff',
-                    'kolab_addressbook.showrevision',
-                    'kolab_addressbook.actionappend',
-                    'kolab_addressbook.actionmove',
-                    'kolab_addressbook.actiondelete',
                     'kolab_addressbook.objectdiffnotavailable',
                     'kolab_addressbook.objectchangelognotavailable',
-                    'kolab_addressbook.revisionrestoreconfirm',
-                    'close'
+                    'kolab_addressbook.revisionrestoreconfirm'
                 );
 
                 $this->plugin->add_hook('render_page', array($this, 'render_audittrail_page'));
diff --git a/plugins/kolab_addressbook/localization/en_US.inc b/plugins/kolab_addressbook/localization/en_US.inc
index 2547de2a..885d75d3 100644
--- a/plugins/kolab_addressbook/localization/en_US.inc
+++ b/plugins/kolab_addressbook/localization/en_US.inc
@@ -53,14 +53,8 @@ $labels['noaddressbooksfound'] = 'No address books found';
 
 // history dialog
 $labels['showhistory'] = 'Show History';
-$labels['compare'] = 'Compare';
 $labels['objectchangelog'] = 'Change History';
 $labels['objectdiff'] = 'Changes from $rev1 to $rev2';
-$labels['actionappend'] = 'Saved';
-$labels['actionmove'] = 'Moved';
-$labels['actiondelete'] = 'Deleted';
-$labels['showrevision'] = 'Show this version';
-$labels['restore'] = 'Restore this version';
 $labels['revisionrestoreconfirm'] = 'Do you really want to restore revision $rev of this contact? This will replace the current contact with the old version.';
 $labels['objectnotfound'] = 'Failed to load contact data';
 $labels['objectchangelognotavailable'] = 'Change history is not available for this contact';
diff --git a/plugins/kolab_addressbook/skins/larry/templates/audittrail.html b/plugins/kolab_addressbook/skins/larry/templates/audittrail.html
index 9411b03a..ad28febc 100644
--- a/plugins/kolab_addressbook/skins/larry/templates/audittrail.html
+++ b/plugins/kolab_addressbook/skins/larry/templates/audittrail.html
@@ -1,6 +1,6 @@
 <div id="contacthistory" class="uidialog" aria-hidden="true">
-    <roundcube:object name="plugin.object_changelog_table" class="records-table changelog-table" domain="calendar" />
-    <div class="compare-button"><input type="button" class="button" value="↳ <roundcube:label name='kolab_addressbook.compare' />" /></div>
+    <roundcube:object name="plugin.object_changelog_table" class="records-table changelog-table" />
+    <div class="compare-button"><input type="button" class="button" value="↳ <roundcube:label name='libkolab.compare' />" /></div>
 </div>
 
 <div id="contactdiff" class="uidialog contentbox" aria-hidden="true">
diff --git a/plugins/kolab_notes/kolab_notes.php b/plugins/kolab_notes/kolab_notes.php
index a0da1201..6d17e197 100644
--- a/plugins/kolab_notes/kolab_notes.php
+++ b/plugins/kolab_notes/kolab_notes.php
@@ -112,9 +112,7 @@ class kolab_notes extends rcube_plugin
         }
 
         // get configuration for the Bonnie API
-        if ($bonnie_config = $this->rc->config->get('kolab_bonnie_api', false)) {
-            $this->bonnie_api = new kolab_bonnie_api($bonnie_config);
-        }
+        $this->bonnie_api = libkolab::get_bonnie_api();
 
         // notes use fully encoded identifiers
         kolab_storage::$encode_ids = true;
@@ -640,12 +638,13 @@ class kolab_notes extends rcube_plugin
             case 'changelog':
                 $data = $this->get_changelog($note);
                 if (is_array($data) && !empty($data)) {
-                    $dtformat = $this->rc->config->get('date_format') . ' ' . $this->rc->config->get('time_format');
-                    array_walk($data, function(&$change) use ($lib, $dtformat) {
+                    $rcmail = $this->rc;
+                    $dtformat = $rcmail->config->get('date_format') . ' ' . $this->rc->config->get('time_format');
+                    array_walk($data, function(&$change) use ($lib, $rcmail, $dtformat) {
                       if ($change['date']) {
                           $dt = rcube_utils::anytodatetime($change['date']);
                           if ($dt instanceof DateTime) {
-                              $change['date'] = $this->rc->format_date($dt, $dtformat);
+                              $change['date'] = $rcmail->format_date($dt, $dtformat);
                           }
                       }
                     });
diff --git a/plugins/kolab_notes/localization/en_US.inc b/plugins/kolab_notes/localization/en_US.inc
index 1c1eed07..9bd46c5d 100644
--- a/plugins/kolab_notes/localization/en_US.inc
+++ b/plugins/kolab_notes/localization/en_US.inc
@@ -58,14 +58,8 @@ $labels['aclnorights'] = 'You do not have administrator rights for this notebook
 
 // history dialog
 $labels['showhistory'] = 'Show History';
-$labels['compare'] = 'Compare';
 $labels['objectchangelog'] = 'Change History';
 $labels['objectdiff'] = 'Changes from $rev1 to $rev2';
-$labels['actionappend'] = 'Saved';
-$labels['actionmove'] = 'Moved';
-$labels['actiondelete'] = 'Deleted';
-$labels['showrevision'] = 'Show this version';
-$labels['restore'] = 'Restore this version';
 $labels['objectnotfound'] = 'Failed to load note data';
 $labels['objectchangelognotavailable'] = 'Change history is not available for this note';
 $labels['objectdiffnotavailable'] = 'No comparison possible for the selected revisions';
diff --git a/plugins/kolab_notes/skins/larry/templates/notes.html b/plugins/kolab_notes/skins/larry/templates/notes.html
index 88cb4e42..0270b45c 100644
--- a/plugins/kolab_notes/skins/larry/templates/notes.html
+++ b/plugins/kolab_notes/skins/larry/templates/notes.html
@@ -110,8 +110,8 @@
 
 <roundcube:if condition="config:kolab_bonnie_api" />
 <div id="notehistory" class="uidialog" aria-hidden="true">
-    <roundcube:object name="plugin.object_changelog_table" class="records-table changelog-table" domain="calendar" />
-    <div class="compare-button"><input type="button" class="button" value="↳ <roundcube:label name='kolab_notes.compare' />" /></div>
+    <roundcube:object name="plugin.object_changelog_table" class="records-table changelog-table" />
+    <div class="compare-button"><input type="button" class="button" value="↳ <roundcube:label name='libkolab.compare' />" /></div>
 </div>
 
 <div id="notediff" class="uidialog contentbox" aria-hidden="true">
diff --git a/plugins/libkolab/js/audittrail.js b/plugins/libkolab/js/audittrail.js
index b680114e..3b389fff 100644
--- a/plugins/libkolab/js/audittrail.js
+++ b/plugins/libkolab/js/audittrail.js
@@ -163,9 +163,17 @@ libkolab_audittrail.render_changelog = function(data, object, folder)
     var i, change, accessible, op_append,
       first = data.length - 1, last = 0,
       is_writeable = !!folder.editable,
-      op_labels = { RECEIVE: 'actionreceive', APPEND: 'actionappend', MOVE: 'actionmove', DELETE: 'actiondelete', READ: 'actionread', FLAGSET: 'actionflagset', FLAGCLEAR: 'actionflagclear' },
-      actions = '<a href="#show" class="iconbutton preview" title="'+ rcmail.gettext('showrevision',data.module) +'" data-rev="{rev}" /> ' +
-          (is_writeable ? '<a href="#restore" class="iconbutton restore" title="'+ rcmail.gettext('restore',data.module) + '" data-rev="{rev}" />' : ''),
+      op_labels = {
+          RECEIVE:   'actionreceive',
+          APPEND:    'actionappend',
+          MOVE:      'actionmove',
+          DELETE:    'actiondelete',
+          READ:      'actionread',
+          FLAGSET:   'actionflagset',
+          FLAGCLEAR: 'actionflagclear'
+      },
+      actions = '<a href="#show" class="iconbutton preview" title="'+ rcmail.gettext('showrevision','libkolab') +'" data-rev="{rev}" /> ' +
+          (is_writeable ? '<a href="#restore" class="iconbutton restore" title="'+ rcmail.gettext('restore','libkolab') + '" data-rev="{rev}" />' : ''),
       tbody = $dialog.find('.changelog-table tbody').html('');
 
     for (i=first; i >= 0; i--) {
@@ -190,7 +198,7 @@ libkolab_audittrail.render_changelog = function(data, object, folder)
             .append('<td class="revision">' + Q(i+1) + '</td>')
             .append('<td class="date">' + Q(change.date || '') + '</td>')
             .append('<td class="user">' + Q(change.user || 'undisclosed') + '</td>')
-            .append('<td class="operation" title="' + op_append + '">' + Q(rcmail.gettext(op_labels[change.op] || '', data.module) + op_append) + '</td>')
+            .append('<td class="operation" title="' + op_append + '">' + Q(rcmail.gettext(op_labels[change.op] || '', 'libkolab') + op_append) + '</td>')
             .append('<td class="actions">' + (accessible && change.op != 'DELETE' ? actions.replace(/\{rev\}/g, change.rev) : '') + '</td>')
             .appendTo(tbody);
     }
diff --git a/plugins/libkolab/libkolab.php b/plugins/libkolab/libkolab.php
index 1dede0d3..0e4c8af3 100644
--- a/plugins/libkolab/libkolab.php
+++ b/plugins/libkolab/libkolab.php
@@ -54,7 +54,7 @@ class libkolab extends rcube_plugin
             kolab_format::$timezone = new DateTimeZone('GMT');
         }
 
-        $this->add_texts('localization/', $rcmail->output->type == 'html' && $rcmail->task == 'mail');
+        $this->add_texts('localization/', false);
 
         // embed scripts and templates for email message audit trail
         if ($rcmail->task == 'mail' && self::get_bonnie_api()) {
@@ -241,6 +241,19 @@ class libkolab extends rcube_plugin
         $table->add_header('operation', $rcube->gettext('operation', $attrib['domain']));
         $table->add_header('actions',   '&nbsp;');
 
+        $rcube->output->add_label(
+            'libkolab.showrevision',
+            'libkolab.actionreceive',
+            'libkolab.actionappend',
+            'libkolab.actionmove',
+            'libkolab.actiondelete',
+            'libkolab.actionread',
+            'libkolab.actionflagset',
+            'libkolab.actionflagclear',
+            'libkolab.objectchangelog',
+            'close'
+        );
+
         return $table->show($attrib);
     }
 
diff --git a/plugins/libkolab/localization/de_DE.inc b/plugins/libkolab/localization/de_DE.inc
new file mode 100644
index 00000000..3ddc8848
--- /dev/null
+++ b/plugins/libkolab/localization/de_DE.inc
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * Localizations for the Kolab libkolab plugin
+ *
+ * Copyright (C) 2015, Kolab Systems AG
+ *
+ * For translation see https://www.transifex.com/projects/p/kolab/resource/libkolab/
+ */
+
+$labels = array();
+$labels['showhistory'] = 'Historie anzeigen';
+$labels['compare'] = 'Vergleichen';
+$labels['objectchangelog'] = 'Historie';
+$labels['objectdiff'] = 'Änderungen aus $rev1 nach $rev2';
+$labels['revision'] = 'Version';
+$labels['user'] = 'Benutzer';
+$labels['operation'] = 'Aktion';
+$labels['actionappend'] = 'Gespeichert';
+$labels['actionmove'] = 'Verschoben';
+$labels['actiondelete'] = 'Gelöscht';
+$labels['showrevision'] = 'Diese Version anzeigen';
+$labels['restore'] = 'Diese Version wiederherstellen';
+$labels['objectchangelognotavailable'] = 'Änderungshistorie ist nicht verfügbar für diese Nachricht';
+
diff --git a/plugins/libkolab/localization/en_US.inc b/plugins/libkolab/localization/en_US.inc
index c74d0040..76c28e5c 100644
--- a/plugins/libkolab/localization/en_US.inc
+++ b/plugins/libkolab/localization/en_US.inc
@@ -27,6 +27,5 @@ $labels['actionflagset'] = 'Flag set';
 $labels['actionflagclear'] = 'Flag removed';
 $labels['showrevision'] = 'Show this version';
 $labels['restore'] = 'Restore this version';
-$labels['objectnotfound'] = 'Failed to load history data';
 $labels['objectchangelognotavailable'] = 'History is not available for this message';
 
diff --git a/plugins/libkolab/localization/fr_FR.inc b/plugins/libkolab/localization/fr_FR.inc
new file mode 100644
index 00000000..707c5a34
--- /dev/null
+++ b/plugins/libkolab/localization/fr_FR.inc
@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * Localizations for the Kolab libkolab plugin
+ *
+ * Copyright (C) 2015, Kolab Systems AG
+ *
+ * For translation see https://www.transifex.com/projects/p/kolab/resource/libkolab/
+ */
+
+$labels = array();
+$labels['compare'] = 'Comparer';
+$labels['objectchangelog'] = 'Historique';
+$labels['revision'] = 'Version';
+$labels['user'] = 'Utilisateur';
+$labels['operation'] = 'Action';
+$labels['actionappend'] = 'Sauvegardé';
+$labels['actionmove'] = 'Déplacé';
+$labels['actiondelete'] = 'Supprimé';
+$labels['showrevision'] = 'Afficher cette version';
+$labels['restore'] = 'Restaurer cette version';
+
diff --git a/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php b/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
index 359e2425..0723eca0 100644
--- a/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
+++ b/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
@@ -57,9 +57,7 @@ class tasklist_kolab_driver extends tasklist_driver
         kolab_storage::$encode_ids = true;
 
         // get configuration for the Bonnie API
-        if ($bonnie_config = $this->rc->config->get('kolab_bonnie_api', false)) {
-            $this->bonnie_api = new kolab_bonnie_api($bonnie_config);
-        }
+        $this->bonnie_api = libkolab::get_bonnie_api();
 
         $this->_read_lists();
 
diff --git a/plugins/tasklist/localization/en_US.inc b/plugins/tasklist/localization/en_US.inc
index 0bf88940..f9d8b397 100644
--- a/plugins/tasklist/localization/en_US.inc
+++ b/plugins/tasklist/localization/en_US.inc
@@ -156,12 +156,6 @@ $labels['saveintasklist'] = 'save in ';
 $labels['taskhistory'] = 'History';
 $labels['objectchangelog'] = 'Change History';
 $labels['objectdiff'] = 'Changes from $rev1 to $rev2';
-$labels['actionappend'] = 'Saved';
-$labels['actionmove'] = 'Moved';
-$labels['actiondelete'] = 'Deleted';
-$labels['compare'] = 'Compare';
-$labels['showrevision'] = 'Show this version';
-$labels['restore'] = 'Restore this version';
 $labels['objectnotfound'] = 'Failed to load task data';
 $labels['objectchangelognotavailable'] = 'Change history is not available for this task';
 $labels['objectdiffnotavailable'] = 'No comparison possible for the selected revisions';
diff --git a/plugins/tasklist/skins/larry/templates/mainview.html b/plugins/tasklist/skins/larry/templates/mainview.html
index 520d0712..24f71015 100644
--- a/plugins/tasklist/skins/larry/templates/mainview.html
+++ b/plugins/tasklist/skins/larry/templates/mainview.html
@@ -244,8 +244,8 @@
 
 <roundcube:if condition="env:tasklist_driver == 'kolab' && config:kolab_bonnie_api" />
 <div id="taskhistory" class="uidialog" aria-hidden="true">
-	<roundcube:object name="plugin.object_changelog_table" class="records-table changelog-table" domain="calendar" />
-	<div class="compare-button"><input type="button" class="button" value="↳ <roundcube:label name='tasklist.compare' />" /></div>
+	<roundcube:object name="plugin.object_changelog_table" class="records-table changelog-table" />
+	<div class="compare-button"><input type="button" class="button" value="↳ <roundcube:label name='libkolab.compare' />" /></div>
 </div>
 
 <div id="taskdiff" class="uidialog taskshow" aria-hidden="true">