[TYPO3-RTE] remap <i> to <em>

[i-legal]

Hello!

If there is <i> in the rte (source code), it is replaced by <em>. This 
<em> is written to the database. But watching to the content in the rte 
<em> is replaced by <i> again. (Although <em> is displayed in the frontend.)
I try to show <em> in the rte also, but I am not able to configure the 
rte right. Please help me! I tried many configurations but nothing 
worked fine.

Greets
MaK

P.S. Excuse for my bad english ;)