Peugeot 206 Speedo & other electrics issues?

Hi, I have a Peugeot 206 GTi 2001 51 plate, recently the Speedo is giving low readings (approx. 10 miles lower than actual). Also the LHS headlight is not working (tried a new bulb) and the headlights come on intermittently. Incidentally the display is suddenly showing in a language I don't recognise.

Any help on diagnosing if there's a common fault & how to resolve the issues would be much appreciated :)