i18n - Not translating Menu's or Blocks
if anyone else is experiencing this issue, notice that it can also be caused by your configuration in yoursite/admin/config/regional/language/configure, even if you are not using Admin Language Module.

Menus are part of your interface, not of content. So, for example, if you set your interface language detection to default (only use site default language), because you want your interface to be only in english, you are not going to see your translated menu blocks when you navigate to yoursite/anotherlanguage!

Hope this helps someone!