Updated locale strings

[Jenjen1324]

There are probably other places as well and I may have replaced too much idk.
I just hotfixed this for my forum so it would work

[matpompili]

There's no need to change the package name. Flarum automatically strips the flarum- prefix from packages names. Anyway, you changed it in main.js only, and did not transpiled it. So it did not affect the extension. I think you only needed to disable and re-enable the extension, to regenerate the locales files. Let me know!