By default CrossOver will get your language and format style from the host operating system. You can manually specify a locale by editing the cxbottle.conf file located in each bottle CrossOver creates.

To locate the cxbottle.conf select the appropriate bottle, click Open C: Drive listed in the right column of the bottle. Go up one level to find the cxbottle.conf file on same directory level as the drive_c folder.

In cxbottle.conf under the EnvironmentVariables section add a new entry for the locale you want to use. For example to set the bottle to Russian you'd enter:

[EnvironmentVariables]
"LC_ALL" = "ru_RU.UTF-8"

Locales that should work are:

• af_ZA
• am_ET
• be_BY
• bg_BG
• ca_ES
• cs_CZ
• da_DK
• de_AT
• de_CH
• de_DE
• el_GR
• en_AU
• en_CA
• en_GB
• en_IE
• en_NZ
• en_US
• es_ES
• et_EE
• eu_ES
• fi_FI
• fr_BE
• fr_CA
• fr_CH
• fr_FR
• he_IL
• hr_HR
• hu_HU
• hy_AM
• is_IS
• it_CH
• it_IT
• ja_JP
• kk_KZ
• ko_KR
• lt_LT
• nl_BE
• nl_NL
• no_NO
• pl_PL
• pt_BR
• pt_PT
• ro_RO
• ru_RU
• sk_SK
• sl_SI
• sr_YU
• sv_SE
• tr_TR
• uk_UA
• zh_CN
• zh_HK
• zh_TW

These are the UTF-8 locales that are present in OS X's /usr/share/locale/ directory, which the "legacy" directory that wine uses for locale information. Other locales not listed above (for instance, es_MX for Mexico or es_GT for Guatemala) will not work at present.