Update translation_RO.json

[discip]

@cipyyy
Your changes should be implemented with this PR.
Unfortunately 2 specific letters (ț and ș) could not be used, remember this was discussed when this language pack was about to be implemented @sandmanRO suggested to leave these out (#1056).

[sandmanRO]

Hello @discip, hello @cipyyy,
@cipyyy, if I may suggest, when you do the Romanian translation try to stick only with the characters from the basic set (that is no diacritics). We both know that the lack of diacritics is tolerated in Romanian writing as their absence does not change the meaning of the words. The letters with diacritics come from extended character sets, and they do not always match and this could lead to all sort of issues when building the firmware.