RB3Enhanced contains a few localised strings that would be best to translate to each language supported by the game:

Generic:

• RB3Enhanced $RB3E_BUILDTAG$ is active. Thank you for playing!
• RB3Enhanced $RB3E_BUILDTAG$ (with $MOD_VERSION$) is active. Thank you for playing!

Modifiers:

• Black Background
• Force HOPOs - HOPOs being hammer-on-pull-offs in guitar
• Mirror Mode - Mirror to mean reversed, like looking into a reflection / mirror
• Gem Color Shuffle - Shuffle to mean the order is mixed around
• Note Shuffle - See above
• Double Bass Pedal - To mean two bass pedals

Liveless:

• Manage Liveless
• Enter the user code of the user you would like to join. (Case insensitive) - Where "user code" is like a 5 letter code, or key, that someone needs to give you to enter.
• Your user code is $USER_CODE$. Anyone with this code and on your server can join you. Server: $SERVER_NAME$
• Connected to the Liveless server! Select 'Join User Code' to join another player, or 'Show My User Code' to show your own user code. (Be careful when streaming - anyone with this code can join you!) - Where "streaming" means livestreaming e.g. on Twitch, YouTube.
• Join User Code
• Show My User Code
• Close

Completed:

• Spanish
• French
• German
• Italian
• Portuguese Brazilian