fix(en-us.json): fix two english typos

[ThibaultNocchi]

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[sonarqubecloud]

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[ferferga]

I approved way too fast

@ThibaultNocchi You sure the context here is plural?

If that's the case, we should also change the keys.

[ThibaultNocchi]

@ferferga haha np. You can see other similar sentences are plural. On internet though, answers say both are valid, but it depends on the context (see here or here). So I'd say it's pretty safe

[camc314]

I'd say subtitles sounds better, it's probably a good idea to change the keys as well though

[ThibaultNocchi]

Ok I'll do this later, I need to make it compatible with #521 as I added similar strings with similar typos.

[ThibaultNocchi]

Gonna do it in #521 with the other strings