We work with texts quite often, and it's very sad when it turns out that the text should have been written in a different case. Instead of editing it, I created a simple application that does the job for us.
It Converts all the text to upper case
It converts all the text to lower case
It converts the first letter of every word to upper case and the rest to lower case
It converts the first letter of the first word of every sentence to upperCase and the rest to lower case
It downloads a text.txt file where there's the modified text.