[5.x] Add optional fallback for missing keys in {{ trans }} tag
#11944
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We're currently building a larger site with dynamic user-supplied translations. Lots of them are missing and we needed a mechanism for displaying a fallback translation if the requested key does not exist. Thought this might be useful to have in the core tag :)
Before
{{ trans key="messages.does_not_exist" }} Output: messages.does_not_existAfter
{{ trans key="messages.does_not_exist" fallback="Literal fallback" }} Output: Literal fallback {{ trans key="messages.does_not_exist" fallback="messages.fallback_key" }} Output: Fallback from existing key