We should mark questions related to Sanskrit language as OFF-topic, BUT I would Not mark questions which ask to explain the meaning (not talking about translation, but literal meaning &/or thought behind the sloka) of a verse/mantra which are written in Sanskrit language.
For example, this is purely a Sanskrit question which I would mark as off-topic -
Correct gender version of Sanskrit name तेजस्वी or tejasvīCorrect gender version of Sanskrit name तेजस्वी or tejasvī
as opposed to this -
Representation of number 0-9 in Sanskrit shlokaRepresentation of number 0-9 in Sanskrit shloka
which asks for Shlokas.
Reason why I prefer keeping Sloka / Mantra related questions as ON topic is because most of our scriptures are written in Sanskrit and am sure, many of the users do not know Sanskrit. If the post is asking to translate a verse, it's OFF-topic, but if a person is trying to understand the reason, meaning behind that verse, should be considered ON-topic.
Lets see community has to say about this.
Note: Please do not get confused between "meaning" and "translation". "Meaning" - is what that verse trying to explain. While "translation" - is converting a sentence to English.