Language change to English
You can either
- Change the language of steam in english
- Force the game to start in English: Right click on the game in your steam library > Properties > Tab "general" > set launch option > type:
-language "English" - See steam support on language settings, section "Changing the language of individual games "
No need for launch options if you want all your games to be in English.
Mine was on Dutch. You should look for the UI elements I mention in your local language.
Right click the steam icon in the notification bar, click Settings. Go to Interface. That's the tab just above Downloads. The top option is "Select the language you wish Steam to use (requires Steam to restart)" and select English. When you press OK, Steam will prompt to restart, do that.
This changed Dota2 to English the next time I started it, without doing anything specific for Dota2.