I installed Magento 2 stable version. and run
static:deploy command. When I change language in locale admin, no change language.
How to add language package? or any other solution?
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There's a german language pack on github: https://github.com/splendidinternet/Magento2_German_LocalePack_de_DE
One option is to use inline translation as was already suggested in comments. You can enable it in Stores -> Configuration -> Advanced -> Developer.
The other option is to create your own language pack. It is easy and very well described here http://devdocs.magento.com/guides/v2.0/config-guide/cli/config-cli-subcommands-i18n.html. Do not run i18n:pack command in step #3, but copy file from step #1 to the directory you create in step #4.
You can share your language pack on GitHub and publish on Packagist, so other people will be able to use your language pack and participate in translation.