This tutorial will show you how to deal with "There are no available languages to install at the moment" error in Joomla 3.x while installing a new language.
Such issue is caused by specific security settings of your server.
In this case you will need to install the needed language pack manually:
Visit the official Joomla community website and locate a desired Language Pack;
Download the Language Pack to your hard drive;
Access your Joomla dashboard;
Make sure the language pack is compatible with your current Joomla engine version;
Install the language pack via Extensions > Manage menu;
Installation has been successfully accomplished.
New language is now available under Extensions > Language(s) menu:
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This is the end of the tutorial. Now you know how to deal with "There are no available languages to install at the moment" error in Joomla 3.x.