This module allows you to specify a language fallback for each defined language, so translation can fallback to another language.
Use case
Your site is using regional variants of languages, like Dutch Netherlands (nl-nl) and Dutch Belgium (nl-be), to set this up you first add the build in Dutch (nl) language and you define 2 custom languages (nl-nl and nl-be). If a string needs to be translated it will first check nl-be, and if the string isn't found it will check nl.
Warning
If you use this module and you get a fatal error, you're probably using an older PHP version (< 5.3.4), the error is caused by line 23. The best fix is to upgrade your PHP version, or change line 23: replace &offsetGet with offsetGet Changing this line might work, but use PHP > 5.3.4
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Similar modules
Related issue: [#2552663]
Language hierarchy has almost the same functionality and contains a list of other similar modules.