Thanks for your question. To change your language setting, click on your name in the upper right corner of the page, choose Preferences from the drop-down list, and scroll down to the Language field, select English, and click save at the bottom of the page.
We don't have a way to filter out posts by language, and unfortunately after setting your language to English, some posts will still appear in other languages. If you'd like to translate a post to another language, take a look at the : Qlik Community Tip: How to Translate Languages.
I hope this helps. Let me know if you have any other questions.
Qlik Community Team