Current behavior:
When a word is added to dictionary, its capitalized version is deemed as incorrect by the spellchecker. However, the world could appear at the beginning of a sentence, therefore be correctly capitalized.

Available workaround (if any):
Add non-capitalized and capitalized version of new words to dictionary or ignore false mistakes.

Requested behavior:
When adding new words to dictionary, users can choose to enable the "Case sensitive" option.