Corsican update for version 3.09a

Hello Patriccollu,

many thanks for the translation update! I wasn't sure about those extra spaces — is this something that's required by the Corsican language or is this a personal preference?

Also, there were some other issues with the language file, namely using = as separator between key and value in some cases (_C_OPT_APPEARANCE).

Regarding your question of a central place to get notified on new language strings, I was thinking about a topic in #development:translations where I could post a reply whenever there is an update. If you then subscribe to the topic, you would get notified.