Maintenance: Corrected translatable source string.

app/assets/javascripts/app/views/widget/text_module.jst.eco

@@ -13,7 +13,7 @@
   <button type="submit" class="btn" data-type="text_module_delete"><%- @T( 'Delete' ) %></button>
 -->
 <!--
-  <%- @T( 'Preview ') %>
+  <%- @T( 'Preview') %>
   <br>
   <textarea id="text-module-preview-content" class="span2"></textarea>
 -->

i18n/zammad.pot

@@ -7217,11 +7217,8 @@ msgstr ""
 #: app/assets/javascripts/app/views/generic/application_selector.jst.eco
 #: app/assets/javascripts/app/views/profile/imageCropper.jst.eco
 #: app/assets/javascripts/app/views/settings/ticket_number.jst.eco
-msgid "Preview"
-msgstr ""
-
 #: app/assets/javascripts/app/views/widget/text_module.jst.eco
-msgid "Preview "
+msgid "Preview"
 msgstr ""
 
 #: app/assets/javascripts/app/views/channel/chat.jst.eco