I made this addon because I started a roleplaying character, I thought that I should capitalize sentences and i's, and I'm too lazy to do that manually. It will capitalize the first letter of each sentence and any 'i' you type. It will also replace words such as im and id with I'm and I'd.
/acc, /autocapchat, /autocapitalizechat - show help
/acc [on/off] - turns acc on or off; words in brackets will be capitalized to show current state ([On/off], [on/OFF])
This addon is not localized, nor will I be localizing it, as I only speak English.