Small edit to English word list.

Version bump to apply new labels in add-on listing. No change in functionality.

- Fixed bug where if lots of stuff was added to the page in a short time some words would be missed
- Performance improvements made by optimizing the regex

- Only run on sites identified as English, German, French or where a language was not set. (This will prevent it from over-writing the Dutch word for 'whoa!' or the Italian verb 'to have'.)
-> It works on the site's language and not on the language of the content so: English content inside an Italian page will no longer be modified and Italian content inside an English page will still be modified.

- Solved a performance problem by letting it replace text a maximum of once every 0.25 seconds.

- Switch to monitoring head, not title, for changes to title
- Add un-accented variation of words to watch list
- Language now defaults to user's language if the page does not specify a language

1) more French words
2) localized manifest file
3) author changed to Mozilla