Fix translations not being updated

[Scrumplex]

Currently the following translations are not being updated by the update script:

• en@pirate - Pirate English
• en@uwu - UwU English
• en_NZ - New Zealand English
• nan - Southern Min
• tok - Toki Pona

[Scrumplex]

It seems like this is the root cause: https://github.com/qt/qttools/blob/2d840624dbeb3bb84e501326187d3ff8bb1be122/src/linguist/lupdate/main.cpp#L425-L429

So I guess it's missing data on how to deal with plurals for these languages?