Smart contracts: get supported languages for filter from the API instead of ENV

[tom2drum]

See blockscout/blockscout#13285 for details

[enochakinbode]

@tom2drum i can handle this

[tom2drum]

Sorry @iamenochlee, this issue is not intended for an external contributor. It may require changes to parts of the code that are not well documented and could be unclear to him.

[enochakinbode]

@tom2drum alright, you can assign me to issues you could use help with.

Thanks