raunhar Hi. I did not know that it's missing in official joomla packages. You will have create one than. Here is an instruction: https://docs.joomla.org/J3.x:Making_a_Language_Pack_for_Joomla it does not need to have all the translations for joomla, You can use English or any language You want. What's important is this .xml file with informations about Your languages, so it can be added to joomla languages and You will be able to start using our component.
But before You start please search the web, I believe there may be an unofficial Azerbijan language package somewhere.