Dear Mother,
In the original language, the words on the wall reads:
HET NOK FaaL VahLOK
DeiNMaaR DO DOVAahGOLZ
ahRK aaN FUS DO UNSLaaD
RahGOL ahRK VULOM
Farengar Secret-Fire managed to translate the meaning:
Here lies the guardian
Keeper of dragonstone
And a force of unending
Rage and darkness
Postcards from Skyrim 