Using "FAQ" in glossary module, the new created categories cannot be displayed correctly in multiple languages using multilang filter. (<span class="multilang" lang="en">...</span> ....)
In the heading, it shows the hole code.
In the drop-down box, it shows all languages one after another (but without code).

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UPDATE (28 June 11):
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Screenshot 1: Shows the category drop-down-box on the right with both languages one after another; in addition, you can see the chosen category in the middle showing the hole code. To fix both of these bugs, add some "format_string()" to /mod/glossary/lib.php

line 1675: $menu[$url] = clean_text(format_string($currentcategory->name));

line 1683: echo format_text(format_string($category->name), FORMAT_PLAIN);

(Attention: These lines are refering to the glossary module version 2010111501. In older or newer versions, the lines may differ!)

Screenshot 2: When editing categories, the overview shows the hole multilang code. In addition, if you try to delete a category, the confirmation page also shows the hole code. Both bugs can also be fixed with some format_string() calls added to /mod/glossary/editcategories.php

line 218: echo "<span class=\"bold\">".format_text(format_string($category->name), FORMAT_PLAIN)."</span> <span>($num_entries " . get_string("entries","glossary") . ")</span>";

line 121: echo "<div class=\"boxaligncenter deletecatconfirm\">".format_text(format_string($category->name), FORMAT_PLAIN)."<br/>";

(Attention: These lines are refering to the glossary module version 2010111501. In older or newer versions, the lines may differ!)

Screenshot 3: The category headings also show all languages one after another. I didn't find a fix for that until now.