English translation improvements

[gingerbeardman]

As for GitHub reporting some of the .strings file as Binary, I think it's a bug/feature their end. But still I added some mitigations in this PR.

• .gitattributes
• .gitconfig
• all English (& Polish because GitHub app) .strings files as UTF-8 with BOM

The "Electron" GitHub Desktop app shows them as Binary.
The GitHub website shows them as Binary.

The "Classic" GitHub Desktop app shows them as Text.

[aonez]

It seems all the problem was using UTF-16 in some files. Converting them to UTF-8 fixes the issue, apparently no .gitconfig needed. Will push an update now with all converted and a script to auto convert them (I'll be using it in the build process).

[aonez]

I'll leave the .gitconfig in case is needed for any of those apps you've named. I'm currently using (and mostly loving) Fork, and this config seems not necessary there or in the website.

[gingerbeardman]

I don't think the .gitconfig is needed if you're including UTF-8 conversion elsewhere.

I'll check out Fork! New GitHub Desktop is a real step back.