I am having difficulties with the spell checker / auto correct on Windows Phone 8 on my Lumia 920. In my language, Belgian Dutch, there is a colloquial pronoun "ge". For instance, you would say "You should go there" = "Ge moet daarnaartoe gaan". So, "ge" is not standard language. It's more a dialect and subsequently it is not "known" by the spell checker.
The solution would be to just type the word and tap on it, then tap on the "+" sign and the word should be added to the word list. This is not possible. Whenever I type "ge" it automatically converts itself to "GE" (capital letters) and there is no way for me to add "ge" to the word list, there is no "+" sign when I tap on it. I am guessing that "GE" is some sort of abbreviation, even though I wouldn't know for what, and WP doesn't allow for multiple instances of the same letters combination, even though it's a difference in capital letters.
TL;DR: Can't type "ge" because WP always converts it to "GE" (capital letters). How to fix this?
UPDATE: After some testing, it seems that it doesn't have anything to do with "colloquial" words, because standard Dutch words such as "me" also get capitalised to "ME". This is really annoying!
UPDATE 2: As I'm involved in certain mobile events as "press", I got the Lumia 1020 to test and it does not show this behaviour. Maybe it is useful that people post in the comments which WP device they have and whether they have the same problem as I have with my Lumia 920.
Do not forget, the problem arises with my Lumia 920 with a Belgian Dutch keyboard!