Regenerate the POT file and pull new translations from Transifex.
Also, update the Transifex URL in the configuration file:
transifex.net has redirected to transifex.com for some time,
and now its certificate has expired.
Update the pot file to match current source, and pull
translations from Transifex
The commands used to create this commit were:
tx pull -fa # needs an account and transifex client setup
cd install/po
make update-pot
(update LINGUAS to contain all languages with translations, and no empty ones)
make update-po