Declare textdomain of .po files inside the header

[Zughy]

Problem

Right now textdomain is extracted in two ways:

• title of the file
• msgctxt field above a string

However, there are cases where more locale files are needed and spamming msgctxt is not the cleanest implementation. Regarding the former: a game with both the mod/locale folder and a world/locale folder (for custom data, e.g. name of NPCs, dialogues, places). We can't have two files with the same name, so right now we can only spam msgctxt in the world folder. strings This is suboptimal and, most importantly, fills Weblate with "Context of this string: your_mod_name" (since it takes the msgctxt field)

Solutions

Use the Project-Id-Version header string to pass the textdomain. It can grep everything before the first -, so people can still use Id and version if they want to (e.g. my_cool_mod-3-5.1).

Custom msgctxt fields can still override the single string textdomain - even if I personally don't find them very useful

Alternatives

No idea

Additional context

This was discussed with @y5nw , so tagging them