Template:SanitiseLanguageCode

<onlyinclude>{{#switch:{{lc:{{{1|}}}}}|
| ar
| be
| bn
| ca
| cn
| cs
| da
| de
| el
| en
| en 
| eo
| es
| es 
| fa
| fi
| fr
| fr 
| he
| hu
| id
| it
| ja
| jp
| ko
| lv
| ms
| nb
| nl
| nn
| no
| pl
| pt
| ro
| ru
| ru 
| se
| si
| sk
| sr
| sv
| ta
| te
| tr
| uk
| us
| vi
| vi  
| zh = {{lc:{{{1|}}}}}
| pt-br
| pt_br = pt_BR
| pt-pt
| pt_pt = pt_PT
| zh-cn
| zh_cn = zh_CN
| zh-hk
| zh_hk = zh_HK
| zh-tw
| zh_tw = zh_TW
| [[Category:Pages with invalid locales]]
}}</onlyinclude>

Convert language-code parameters ("eN", "Pt-Br" etc.) to a canonical version, convert unknown values to the empty string. Please call this from other templates to sanitise your boolean values.

Template parameters[Edit template data]

Parameter		Description	Type	Status
Value	1	Value to convert to a language code Suggested values ar be bn ca cn cs da de el en en eo es es fa fi fr fr he hu id it ja jp ko lv ms nb nl nn no pl pt pt_br pt_pt ro ru ru se si sk sr sv ta te tr uk us vi vi zh zh_cn zh_hk zh_tw Example pt_BR	Unknown	required