Tiger I book G4 icons in gibberish to english

Have you restarted your Mac lately?

Rebooting is the best first step in troubleshooting.

If a simple reboot of your Mac doesn’t fix things, see if the problem still happens in safe mode.  Safe mode will often correct weird software behavior by forcing the OS to clear caches, do disk repair and other self-maintenance and housekeeping and temporarily disables third-party mods.

How to use safe mode on your Mac - Apple Support 

Does the same thing happen while in Safe mode?

You can exit safe mode by restarting your Mac normally, then reevaluate the problem.

How about a screenshot or photo of issue. A picture can take the place of a thousand words.

For your PowerPC-based iBook G4, check out this article: "How to Get to Boot Options Menu on Power Mac G4."

To boot into Safe Mode: