Autodetect spell-checker language in Chrome using custom rules?

Question

In the Chrome web-browser (current version: 32.0.1700.41 m Aura), how can I have Chrome AUTOMATICALLY detect the spell checker language for input fields, using sets of custom rules, for example:

1. Depending from the current domain, for example:
   *.de // changes spell-checker language to German
   englishforum.com // changes spell-checker language to English
   etc. etc.

2. Autodetect using a smart algorithm (used when not covered by #1): Internally uses the activated spell checker languages and tests which language produces the least amount of errors, then changes the spell checking language to this language.

Is there a Google Chrome extension for this?