Make [fr] removal looser

[tusbar]

Removes all variants of [fr], [fr ], [ FR], etc.

[buildsize]

This change will increase the build size from 196.34 KB to 214.4 KB, an increase of 18.06 KB (9%)

File name	Previous Size	New Size	Change
manifest.json	745 bytes	745 bytes	0 bytes (0%)
arma-[version].png	6.15 KB	6.15 KB	0 bytes (0%)
arma-[version]gs.png	4.67 KB	4.67 KB	0 bytes (0%)
messages.json	1.12 KB	1.12 KB	0 bytes (0%)
background.html	273 bytes	273 bytes	0 bytes (0%)
popup.html	366 bytes	366 bytes	0 bytes (0%)
background.[version]f[version]b[version]d[version]d[version]b[version]e.js	7.45 KB	[deleted]
popup.[version]d9fb[version]a3b4da[version].js	159.16 KB	159.16 KB	0 bytes (0%)
common.c4a67d67c48cba54a82a.js	16.44 KB	[deleted]
background.d5345507e5e4eafad1a1.js	[new file]7.4 KB
common.[version]b[version]aff1c[version]a[version].js	[new file]16.44 KB