Translating file options

Hello.In visualeditor, MediaWiki:Visualeditor-dialog-media-type-frameless/ro and MediaWiki:Visualeditor-dialog-media-type-border/ro has already been translated.Greetings

Yes, but these are only the labels for the form. I'm interested in the wikitext that ends up in the page source.

Please provide a picture from Commons for clarification

Picture of what,wikitext? [[File:Example.pg|left|thumb]] Parameters like "thumb" and "left" can be translated, but I am not sure how.

You can find these in MediaWiki core: $magicWords array in languages/messages/MessagesXX.php.