In Latvian Wikipedia (and in English Wikipedia, at least) some Arabic text isn't displayed correctly when using lang template, for example, Persian language. The code, if using lang template, is <span lang="fa">Some text in Persian فارسی</span> and the result is too bold.
Example how it looks like
http://www.bildites.lv/images/o5rsojoes9bmak4nppm4.jpg (the "persiešu: پامیر, Pāmīr;" part)
example how it should look like
(updated) Example in Latvian Wikipedia: https://lv.wikipedia.org/wiki/Lietot%C4%81js:Edgars2007/Arabic (how it is currently and how it should be)
and in English Wikipedia: https://en.wikipedia.org/wiki/Persian_language
This problem has been for approximately seven days.