After a quick look, this seems to be related to the fact that these translations are shipped in language packs (in /usr/share/locale-langpack), whereas the code refers to the non-language-pack location (/usr/share/locale) when loading translations.
Added a branch with a proposed fix
After a quick look, this seems to be related to the fact that these translations are shipped in language packs (in /usr/share/ locale- langpack) , whereas the code refers to the non-language-pack location (/usr/share/locale) when loading translations.
Added a branch with a proposed fix