The most used localization codes

Localization_codes.php

English, US (en_US)	
German, Germany (de_DE)	
Chinese, PRC (zh_CN)
Chinese, Taiwan (zh_TW)	
Czech, Czech Republic (cs_CZ)	
Dutch, Belgium (nl_BE)	
Dutch, Netherlands (nl_NL)
English, Australia (en_AU)	
English, Britain (en_GB)	
English, Canada (en_CA)	
English, New Zealand (en_NZ)	
English, Singapore(en_SG)	
French, Belgium (fr_BE)
French, Canada (fr_CA)	
French, France (fr_FR)	
French, Switzerland (fr_CH)	
German, Austria (de_AT)	
German, Liechtenstein (de_LI)	
German, Switzerland (de_CH)	
Italian, Italy (it_IT)	1.5
Italian, Switzerland (it_CH)
Japanese (ja_JP)	
Korean (ko_KR)	
Polish (pl_PL)	
Russian (ru_RU)	
Spanish (es_ES)	
Arabic, Egypt (ar_EG)	
Arabic, Israel (ar_IL)
Bulgarian, Bulgaria (bg_BG)	
Catalan, Spain (ca_ES)	
Croatian, Croatia (hr_HR)	
Danish, Denmark(da_DK)	
English, India (en_IN)	
English, Ireland (en_IE)	
English, Zimbabwe (en_ZA)	
Finnish, Finland (fi_FI)	
Greek, Greece (el_GR)	
Hebrew, Israel (iw_IL)
Hindi, India (hi_IN)	
Hungarian, Hungary (hu_HU)	
Indonesian, Indonesia (in_ID)
Latvian, Latvia (lv_LV)	
Lithuanian, Lithuania (lt_LT)	
Norwegian-Bokmol, Norway(nb_NO)	
Portuguese, Brazil (pt_BR)
Portuguese, Portugal (pt_PT)	
Romanian, Romania (ro_RO)	
Serbian (sr_RS)	
Slovak, Slovakia (sk_SK)	
Slovenian, Slovenia (sl_SI)	
Spanish, US (es_US)	
Swedish, Sweden (sv_SE)	
Tagalog, Philippines (tl_PH)	
Thai, Thailand (th_TH)	
Turkish, Turkey (tr_TR)
Ukrainian, Ukraine (uk_UA)	
Vietnamese, Vietnam (vi_VN)