Better support for multilanguage content

[wwalc]

Similar to Issue #17 for SCAYT

When I try the sample of CKEditor 4.3 Beta with the language plugin enabled, enter there content in a different language:

<span dir="ltr" lang="es">
El invierno pasado estuvo tan fr&iacute;o que literalmente se form&oacute; hielo en mi barba.&nbsp;
</span>

and then start the spellchecker dialog, it will not understand the whole text, even though it has the proper Spanish dictionary included. It happens because it treats the whole content as if it was written in English.

Ideally, it should detect elements with lang attribute and use proper dictionaries automatically.

[WebSpellChecker]

Status is the same as for Issue #17 for SCAYT. We consider this is as a new feature, not an issue. The investigation is added to backlog. We'll keep you posted on its status