Added a new configuration key to language.php config file, which makes it possible to disable Accept-language check in pick_language.php hook
Updated config comment section header
Updated config comment section header
Delete language.php.orig

Removed git artifact
Merge remote-tracking branch 'upstream/2.2/develop' into accept-language-disable
Merge pull request #3275 from kimse1/accept-language-disable

Added option to turn Accept-language on/off