Session on Windows wants to spell-check using American English, no
matter what I do. This seems to be because it wrongly assumes my locale
to be `en-US`, when it is actually `en-GB`.
```
"spellcheck: setting languages to: [\"en-US\"]","time":"2022-10-10T19:19:09.216Z"
```
With this patch, Windows will use `$LANGUAGE`, if set, to determine the
language to be used for spell-checking.
Linux is unaffected by this patch and will correctly infer the
spell-checking language from `$LANG`.
Create a .bat file and start Session from this:
```
@echo off
set LANGUAGE=en-GB
"C:\Users\ian\AppData\Local\Programs\Session\Session.exe" --lang=en-GB
```
Note that the use of `--lang=<language>` above sets only the Session UI
language, not the spell-checker language.
This is a partial fix for #2013, specifically [this comment](https://github.com/oxen-io/session-desktop/issues/2013#issuecomment-998679090):
Audric Ackermann
Ryan Miller
Audric Ackermann
Ian Macdonald