Google is known as a multilingual Web in the Wide World, besides that is has its Google search in almost every language also has translation, and of course they have Google Plus in many languages too.
Changing Google Plus Account Language
1. Login to your Google Plus account, go to the right corner above, click on Options and select Google+ Settings.
2. From the menu on the right side click on Language.
3. Now here you can change your default Google Plus language. Select your language from the drop down list, refresh the page and your language will be changed.
I changed my default Google Plus language into Turkish and the results are shown in the picture below.