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language
简体中文 (Simplified Chinese)
繁體中文 (Traditional Chinese)
日本語 (Japanese)
한국어 (Korean)
ไทย (Thai)
Български (Bulgarian)
Čeština (Czech)
Dansk (Danish)
Deutsch (German)
Español - España (Spanish - Spain)
Español - Latinoamérica (Spanish - Latin America)
Ελληνικά (Greek)
Français (French)
Italiano (Italian)
Bahasa Indonesia (Indonesian)
Magyar (Hungarian)
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Norsk (Norwegian)
Polski (Polish)
Português (Portuguese - Portugal)
Português - Brasil (Portuguese - Brazil)
Română (Romanian)
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Suomi (Finnish)
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Türkçe (Turkish)
Tiếng Việt (Vietnamese)
Українська (Ukrainian)
Report a translation problem
http://steamcommunity.com/discussions/forum/search/?q=steam+changes+language
and
https://store.steampowered.com/account/languagepreferences
set accordingly.
some search results for Steam on google f.e. include ?l=language parameter in the link, they will make default website language change.
http://store.steampowered.com/ ?l=german (remove the space before the question mark)
if you browse Steam mostly in your normal webbrowser, consider looking into enhancedsteam addon, it has some features regarding the used language on Steam, like this: https://i.imgur.com/X9qD6Gt.png