[Tails-l10n] Bad Transifex strings vs Tails 3.9.1

Hi,

While preparing Tails 3.9.1 I refreshed our translations but saw tons of bad translations like:

    -msgstr "{beginning} এবং {last}"
    +msgstr "{বিগিনিং} এবং {লাস্ট}"

i.e. they are translating gettext's variable names. I couldn't import anything since each updated PO file had serious issues like these.

Cheers!