Add dummy translation function to mark translatable strings

[pafcu]

Signed-off-by: Stefan Parviainen pafcu@iki.fi

Add a new function _td() which is used to mark strings as translatable in contexts where _t() does not work (i.e. before translations have been initialized). It does not actually do anything with the strings, just returns the input. You still need to call _t() later to do the actual translation.

[ara4n]

this is great, thanks! I suspect it needs to be added to the translation readme otherwise nobody will understand how to use it...

[pafcu]

Sure, I'll add it to the documentation too. However, I wanted to see if I get some protests regarding e.g the function name (I suppose it might be better with e.g. translatable(), or not having the leading underscore), but I decided to go with something as similar as possible to the existing _t() function. The one-letter difference does make it easier to extract strings using a regular expression since you can just find everything using _t(d|Jsx)? rather than something more complex.

[ara4n]

_td() is fine by me; we already have _tJsx and huffmanizing super-common special functions like this. plus it'll be trivial to change in future!

[pafcu]

element-hq/element-web#5110 now also includes a commit to document when to use _td()

[ara4n]

lgtm - thanks!

[lukebarnard1]

@pafcu I've reviewed element-hq/element-web#5110