Casing of autonyms

[MrBrezina]

The autonyms should probably follow conventions of the language (reference texts) as per @moyogo ’s remark here. How do we fix this, collectively or one by one? Also, need to update the instructions.

[kontur]

Imo there is no other way than manual; presumably the cases where uppercase needs to be added is the minority. I'm open to updating these bit by bit.