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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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4 Answers 4

up vote 10 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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5  
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)'

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1  
Have this +1, since you were just a few seconds too late. Thanks for the preferences tip, I didn't know it. –  zneak Aug 18 '10 at 21:22
    
Next time I'll be faster ;) –  Studer Aug 18 '10 at 21:27
    
it's a good way but it's not easy as Language Switcher can do. –  Am1rr3zA Aug 18 '10 at 21:30
5  
Depends if you're more a GUI- or a CLI-man. –  Studer Aug 18 '10 at 21:51

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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It won't really solve my problem: most of the time I want to run a program in French, but sometimes it will be English. –  zneak Aug 18 '10 at 21:13
3  
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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1  
How does this differ from @Avi's answer made 3 years ago? –  Mark Aug 25 '13 at 11:07

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