Update po/pot files, and make sure this is done automatically

[mxmehl]

The pot file seems to be outdated which leads to a situation in which the translations on Weblate Hosted are shown as 100% complete which they are not in fact.

What would be the ideal workflow here? I ran po4a po/po4a.conf (with version 0.66), but the resulting changed (patch attached) look like the markdown-text attributes has been removed in a number of places, and strings are also formatted differently (like start on different lines, and shifted around).

Will this be safe to commit, or does it interfere with existing translations? What would be the best workflow?

Also, in order to make this as frictionless as possible, we should make this process somewhat automatic, or at least document it.

@eighthave, I hope you could help here. Thanks!

0001-re-reun-po4a.patch.txt