Improve the text quality of your app in 5 min

Every time IT delivers an application quality is many times neglected.
One thing you can do is to avoid word mistakes like "aplication" in all over your application which gives a bad impression of your outcome.
We've used a Firefox add-on to evaluate words mistakes.
1. Allow you to check words in your development website (off-line)
2. Fast mistakes identification
1. No suggestions
2. No custom dictionary
Do you know any other way to do this?