Dear, I need to install and configure 10 languages in Magento 2.2 eshop.
From where can I download them and how can I install the core translations? What is the right way for this operation, because I think it`s not good to translate everything by Inline translating??
There are packages available so you can download it and install it.
You can find out similar language pack.
Make sure while doing static content deploy pass nl_NL de_DE
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There are already pre-built multiple language pack is available for translations.
So you can install that language pack in your magento 2 system and configure it for the same.
Here is the list of almost all language pack , refer this link - https://www.mageplaza.com/kb/magento-2-language-pack/
Here is the link for how to install and configure language pack in your magento 2 application - https://github.com/splendidinternet/Magento2_German_LocalePack_de_DE
Hope it helps !!!