This template returns a fallback language of a given language:

| af = nl
| als = de
| br | co | oc = fr
| ca | eu = es
| crh-cyrl | crh-latn = crh
| de-formal | de-at | de-ch = de
| hif-deva | hif-latn = hif
| ike-cans | ike-latn = ike
| ksh = de
| kk-arab | kk-cyrl | kk-latn | kk-cn | kk-kz | kk-tr = kk
| ku-latn | ku-arab = ku
| mg = fr
| nds = nds-nl
| nds-nl = nds
| pdt = nds
| pt-br = pt
| pt = pt-br
| ruq-cyrl | ruq-grek | ruq-latn = ruq
| sr-ec | sr-el = sr
| tg-cyrl | tg-latn = tg
| tt-cyrl | tt-latn = tt
| vec = it
| yi = he
| zh | zh-cn | zh-hans | zh-hk | zh-mo | zh-my | zh-sg | zh-tw = zh-hant 
| en-gb | #default = en
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