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I'm a developer, and my primary language is French, so I use Mac OS X in French. However, I need on a regular basis to open an application in English to do support.

Right now I'm going to the International System Preferences and I put English above in the languages list, then I open the app I need to run in English. When I'm done, I switch it back to French.

This is an annoying process. Is there something else I can use, like a command-line program, to launch an application in a specific language?

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up vote 16 down vote accepted

There is a freeware, Language Switcher, to launch single applications with a different language.

it's really simple and work amazing.

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8  
Under the hood, it just launches the program with a -AppleLanguages (French) switch, which is what I really needed. Thank you! – zneak Aug 18 '10 at 21:21

You can change the language inside the preferences file of the application :

defaults write com.apple.TextEdit AppleLanguages '("en-US")'

Or just run once one application with another language :

/Applications/iCal.app/Contents/MacOS/iCal -AppleLanguages '(de)'

To determine the bundle identifier, run

mdls -name kMDItemCFBundleIdentifier /Applications/Mail.app

or directly in one command:

defaults write $(mdls -name kMDItemCFBundleIdentifier -raw /Applications/Mail.app) AppleLanguages '("en-UK")'

(via SuperUser)

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Go to the app, Press Command + I and if there are other languages they will show up in the info page. Just untick all except the language you want

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4  
This no longer work in Snow Leopard. – Loïc Wolff Aug 18 '10 at 21:59

In the Finder, get info on the application. There are languages here, and you can choose. Alas, this seems to have disappeared in Snow Leopard.

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2  
How does this differ from @Avi's answer made 3 years ago? – Mark Aug 25 '13 at 11:07

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