PO files

[glixx]

PO files must have names: ru.po, de_DE.po (de.po?), en_US.po, etc.
PO files must be in directory ./po

File en_US.po is excess, because no difference with English, which is used by default.

[glixx]

Because csg will be translated in future, then better:
PO files must have names: canta-ru.po, canta-de_DE.po (canta-de.po?), canta-en_US.po, etc.
PO files must be in directory ./po

File canta-en_US.po is excess, because no difference with English, which is used by default.

[glixx]

And for unification:
sed -i -e 's|"canta"|prg_name|g' ./scripts/compile_translations.py