translate
Translates a (English) value to the current language or the given language.
If the input is a #trans{} record then it is extended with the translations
from the .po files before the language lookup is done. For this the #trans{}
record must have the English translation.
Example with the default language lookup (accessible via the template variable z_language):
{{ "Cancel"|translate }}
If the current language is de then the output is: "Abbrechen".
An example with a specific language:
{{ "Cancel"|translate:"nl" }}
The output would be "Annuleer".