Set any locale (language) as you want.
Add widgets to switch locale with one touch from the home screen and without having to go all the way to the settings menu.
Very convinient for multi-language app test.

Locale list:
cs_CZ - čeština (Česká republika)
da_DK - dansk (Danmark)
de_AT - Deutsch (Österreich)
de_BE - Deutsch (Belgien)
de_CH - Deutsch (Schweiz)
de_DE - Deutsch (Deutschland)
de_LI - Deutsch (Liechtenstein)
de_LU - Deutsch (Luxemburg)
el_GR - Ελληνικά (Ελλάδα)
en_AU - English (Australia)
en_BE - English (Belgium)
en_BW - English (Botswana)
en_BZ - English (Belize)
en_CA - English (Canada)
en_GB - English (United Kingdom)
en_HK - English (Hong Kong SAR China)
en_IE - English (Ireland)
en_IN - English (India)
en_JM - English (Jamaica)
en_MH - English (Marshall Islands)
en_MT - English (Malta)
en_NA - English (Namibia)
en_NZ - English (New Zealand)
en_PH - English (Philippines)
en_PK - English (Pakistan)
en_SG - English (Singapore)
en_TT - English (Trinidad and Tobago)
en_US - English (United States)
en_VI - English (U.S. Virgin Islands)
en_ZA - English (South Africa)
en_ZW - English (Zimbabwe)
es_ES - español (España)
es_US - español (Estados Unidos)
fr_BE - français (Belgique)
fr_CA - français (Canada)
fr_CH - français (Suisse)
fr_FR - français (France)
fr_LU - français (Luxembourg)
fr_MC - français (Monaco)
it_CH - italiano (Svizzera)
it_IT - italiano (Italia)
ja_JP - Japanese (Japan)
ko_KR - 한국어 (대한민국)
nb_NO - norsk bokmål (Norge)
nl_BE - Nederlands (België)
nl_NL - Nederlands (Nederland)
pl_PL - polski (Polska)
pt_BR - português (Brasil)
pt_PT - português (Portugal)
ru_RU - русский (Россия)
sv_SE - svenska (Sverige)
tr_TR - Türkçe (Türkiye)
zh_CN - 中文 (中国)
zh_HK - 中文 (中国香港特别行政区)
zh_TW - 中文 (台灣)