"Remove language" removes only first language

[Piotr Jasiun]

1. Open any browser (tested in IE8 and Chrome).
2. Open replace by class example.
3. In source mode put content:

   <p><span dir="ltr" lang="es">xxx <span dir="rtl" lang="ar">foo</span> xxx</span></p>
   

4. Go to WYSIWYG mode.
5. Select all.
6. From Language menu select "Remove language"

Expected behavior: both es and ar languages will be removed.

Actual behavior: only es attribute is removed.

[Piotrek Koszuliński]

This is an intentional behaviour. Note that the option is called "Remove language", not "Remove languages".