Adding new permission key access_user_search_export without localization stuff

Let's keep localization-related stuff only in views when possible.
The translatable strings are being detected from the xml file (see #1332), so we can safely strip out localization-related stuff (and keep a cleaner the code).

@tylerryan Sorry for the extra & useless work [I caused you](https://github.com/concrete5/concrete5/commit/59c38ff5880aa22217c68bfab3d97df452e7fa33#commitcomment-3986479)...