OK, I just fixed the problem, so for anybody who will have the same problem, I will write, what I've done.
I used the format method in MTK-Tool whith manual settings:
Beginn-Address: 0x00E00000
Format-Length: 0x00200000
After I formatted the phone with this settings, I used Spiderman Vers. 2.55 and flashed the phone with the firmware, I'd like to use, in this case the one with german language files!
And voila, phone still is alive again and german language is now availible for me.
Great job, brother Slyme