Quality check for docs

[Claude Paroz <claude 2xlibre net>]

Hi translators,

I just activated a small new functionality for uploaded docs po file on 
l10n.gnome.org.
You'll notice a new icon top right of comments with doc po files, 
allowing to run an xml quality check through translate-toolkit pofilter.

We might use other pofilter checks (also for ui files) depending on your 
feedback. This may also be team-specific.

Claude
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