Catch errors in weblate with a pre-commit hook

[robe]

This would be to catch issues like this

​https://woodie.osgeo.org/postgis/postgis/build/308/1

1212
/usr/bin/xsltproc --novalid --path ../../../../doc/po/fr xsl/postgis_aggs_mm.xml.xsl postgis-out.xml > postgis_aggs_mm.xml
206s
1213
administration.xml:222: parser error : EntityRef: expecting ';'
206s
1214
>Pas de chemin de migration défini pour ... vers &last_release_version ;</progr
206s
1215
^

Where user puts a space before ;

[strk]

I've no idea how weblate would react to a failing pre-commit hook, should be tested on some staging deploy

[strk]

From the #weblate IRC channel on libera.chat someone suggested we could write custom checker for weblate: ​https://docs.weblate.org/en/latest/admin/checks.html#writing-own-checks

[strk]

We could also consider using auto-fix for the XML entities — time to experiment a bit on a staging machine (with no automatic push!) ?