Update de.h.txt

Line 322 Colum 180 and Line 324 Colum 172 
german was different to engish
TR_TELEM_RSSI_RX missing
At opentx  telemetrie no RSSI selection at special funktions
hope thats all
Merge pull request #1279 from hrenz/patch-4

Update de.h.txt    there was no RSSI selction at SF and Telemetrie