Fixed Slovak translation messages.json

[dodog]

Fixed Slovak translation

[Bilb]

Hey,
thanks for the translations.
We use Crowdin to keep the translations up to date. Could you check what needs to be updated there based on your changes?
https://crowdin.com/project/session-desktop
Thanks

[dodog]

A few months ago I translated all the remaining strings for Session Desktop, iOS and Android and fixed the incorrect translations on Crowdin, but it doesn't seem to sync with Github.
Since then, several versions of Session have been released, but the Slovak translation is still full of typos, incorrect translations and English strings.
So I concluded that Crowdin is no longer used for translations and that is why I created a pull request here.

[Bilb]

Hey, sorry for the delay I've just pulled the changes from crowdin and your changes seems to be there, in this PR #2958