Update translator documentation.

i18n/L10n fixes.
Superfluous whitespace removed.
onPluginVersion() added where missing.

plugins/Autocomplete/AutocompletePlugin.php

@@ -79,6 +79,7 @@ class AutocompletePlugin extends Plugin
                             'author' => 'Craig Andrews',
                             'homepage' => 'http://status.net/wiki/Plugin:Autocomplete',
                             'rawdescription' =>
+                            // TRANS: Plugin description.
                             _m('The autocomplete plugin allows users to autocomplete screen names in @ replies. When an "@" is typed into the notice text area, an autocomplete box is displayed populated with the user\'s friend\' screen names.'));
         return true;
     }