Replacing hardcoded messages in admingroups.vm

Replaced hard-coded messages in admingroups.vm template with $msg.get("term")

• <div id="ajax-loader">Loading...<br />
  <img src="$xwiki.getSkinFile('icons/ajax-loader.gif')" alt="Loading..." title="Loading..." />
  </div>

+
<div id="ajax-loader">$msg.get("ui.ajaxTable.loading")<br />
<img src="$xwiki.getSkinFile('icons/ajax-loader.gif')" alt="$msg.get('ui.ajaxTable.loading')" title="$msg.get('ui.ajaxTable.loading')" />
</div>

• <td>Group Name</td><td>Members</td><td>Manage</td>

+ <td>$msg.get("rightsmanager.groupname")</td><td>$msg.get("rightsmanager.members")</td><td>$msg.get("rightsmanager.manage")</td>

• <option value="local" selected="selected">Local</option>
  <option value="global">Global</option>
  <option value="both">Both</option>

+
<option value="local" selected="selected">$msg.get("rightsmanager.local")</option>
<option value="global">$msg.get("rightsmanager.global")</option>
<option

Add new term "rightsmanager.groupname= Group name" in Application.Resources and Application.Resources_en respectively.

Customized Application.Resources_de to XWiki Enterprise 1.5.