[skip ci] improved Azerbaijani translations

Just a readme update.
"If you do not want any hidden input, you should explicitly set this option as null."

close #5823

issue #4198

issue #4198

docs/guide-ja/structure-application-components.md added [ci skip]

[ci skip] Update tutorial-i18n.md

New Chinese translations

change the param name on Url

typo fix

Docs ja guide applications [ci skip]

Забыли закрыть фигурную скобку.

typo fix

has been translate the param and wasn't working

[skip ci] Update runtime-url-handling.md

update caching-http.md [skip ci]

Use travis_retry in .travis.yml