OzTheGreat

Adds a multiple select box to every non-admin user profile that allows admins to 
select which languages that user can see / edit in the wp-admin.
Languages that a user cannot see are hidden. If they try to switch surreptitiously 
it will throw an error message.
This plugin REQUIRES WPML and is useless without it.

WPML Editor Languages

Allows admins to restrict users to specific languages in the WordPress admin

Atakan Au

Dilbaz Localization Tool helps developers find and export translatable strings from WordPress plugins and themes.
The plugin scans PHP files and detects common WordPress translation functions such as:
<ul>
<li>__()</li>
<li>_e()</li>
<li>_x()</li>
<li>_n()</li>
<li>esc_html__()</li>
<li>esc_attr__()</li>
</ul>
A POT file can be generated instantly for translation workflows.
This tool is especially useful for:
<ul>
<li>Plugin developers</li>
<li>Theme developers</li>
<li>Localization teams</li>
</ul>
<h3>Features</h3>
<ul>
<li>Scan plugins and themes for translation strings</li>
<li>Detect common WordPress gettext functions</li>
<li>Generate POT files</li>
<li>Display string locations</li>
<li>Lightweight scanning engine</li>
</ul>

Dilbaz Localization Tool

Scan plugins and themes to extract translatable strings and generate POT files directly from the WordPress admin panel.

WPML Editor Languages vs Dilbaz Localization Tool