Improve translations in Mallard

[Gil Forcada <gforcada gnome org>]

Hi all,

I added a couple of bugs to Yelp regarding mallard translations.

In [1] I ask for adding msgctxt to all Mallard strings so that the (p),
(title) and other hints that are easily seen by the translators as are
now that are only available on the source reference.

In [2] I ask for filtering comments on translations, since I suppose
that are only useful for the documentation team and doesn't make any
sense to translate (prove me wrong though).

Cheers,

[1] https://bugzilla.gnome.org/show_bug.cgi?id=662508
[2] https://bugzilla.gnome.org/show_bug.cgi?id=662509

-- 
Gil Forcada

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