property |NSURL| : a reference to current application’s |NSURL|
property NSBundle : a reference to current application’s NSBundle
property NSWorkspace : a reference to current application’s NSWorkspace

set anApp to path to (choose application)

tell application "Finder"
　　set aBundle to properties of anApp
　　set targID to id of aBundle –Get Bundle ID
end tell

set bRes to getLocalizationsFromBundleID(targID) of me
set cRes to my sort1DList:bRes ascOrder:true

set dRes to (choose from list cRes)
if dRes = missing value or dRes = false then return

set targLanguage to first item of dRes

set appPath to retPathFromBundleID(targID) of me

set sText to "open -n -a " & quoted form of appPath & " –args -AppleLanguages ’(＼"" & targLanguage & "＼")’"
do shell script sText

on getLocalizationsFromBundleID(aBundleID)
　　set aRes to retPathFromBundleID(aBundleID) of me
　　if aRes = false then error "Wrong Bundle ID."
　　return getSpecifiedAppFilesLocalizationListWithDuplication(aRes) of me
end getLocalizationsFromBundleID

–指定アプリケーションファイルの、指定Localeにおけるローカライズ言語リストを求める。重複を許容
on getSpecifiedAppFilesLocalizationListWithDuplication(appPOSIXpath)
　　set aURL to (|NSURL|’s fileURLWithPath:appPOSIXpath)
　　set aBundle to NSBundle’s bundleWithURL:aURL
　　set locList to aBundle’s localizations()
　　return locList as list
end getSpecifiedAppFilesLocalizationListWithDuplication

on retPathFromBundleID(aBundleID)
　　set aURL to NSWorkspace’s sharedWorkspace()’s URLForApplicationWithBundleIdentifier:aBundleID
　　if aURL = missing value then return false –Error
　　return aURL’s |path|() as string
end retPathFromBundleID