Hi mekici 
I don’t have answers to your inbox issue…
edit: Maybe, for some reason, the inbox URL is wrong? What URL does your inbox URL lead to?
However, for this one:
I suppose “Toics” is a typo and you meant “Topics”? For “My Posts”, we’re aware of the issue. It doesn’t get translated though the two “My Posts” strings are properly translated in admin → customize → text.
Here’s a screenshot from a French instance:
However, I don’t see where is the untranslated “Topics” text. Can you tell us where on the interface did you see it?