The essence of my suggestion is the multilanguage filter to search only for lang="xx" attributes in html tags regardless of the kind of tag and other tag attributes. The new version of the multilang filter finds each sequence of identical tags with lang="xx" attributes. For example:
<h1 lang="en">A heading in English</h1>
<h1 lang="bg">A heading in Bulgarian</h1>
or
<p lang="en" style="...">A paragraph in English</p>
<p lang="bg" class="...">A paragraph in Bulgarian</p>
<p lang="ro">A paragraph in Romanian</p>
and so on.
And the filter chooses and shows only the tag with a lang attribute for the current language.
The advantages of this are:
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Flexibility.
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Compatibility - this works with old multilanguage syntax with <lang> tags as well as with the new syntax with <span class="multilang" lang="xx"> tags and with <div> tags in case the MDL-32257 improvement is used.
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Opportunity to add and remove lang tags with TinyMCE editor. I think it will be easy to implement such functionality in TinyMCE.
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Simplicity of the regexpresion used for search pattern resulting in a higher speed.
I implemented this suggestion and the source code is here:
https://github.com/vanyog/moodle/blob/master/filter/multilang/filter.php
or as attachment to this message.
Please, if you are interested, test it and give some feedback.