info.plist

<!-- /Applications/Colobot.app/Contents/info.plist -->
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>CFBundleDevelopmentRegion</key>
	<string>English</string>
	<key>CFBundleDisplayName</key>
	<string>Colobot</string>
	<key>CFBundleExecutable</key>
	<string>colobot</string>
	<key>CFBundleIconFile</key>
	<string>Colobot</string>
	<key>CFBundleIdentifier</key>
	<string>info.colobot.colobot</string>
	<key>CFBundleInfoDictionaryVersion</key>
	<string>6.0</string>
	<key>CFBundleName</key>
	<string>Colobot</string>
	<key>CFBundlePackageType</key>
	<string>APPL</string>
	<key>CFBundleSignature</key>
	<string>cbot</string>
	<key>CFBundleVersion</key>
	<string>0.1.6-alpha</string>
</dict>
</plist>

The Question

`/Applications/Colobot.app/Contents/MacOS/colobot --language=pl`

/\ This opens the polish translation of http://colobot.info/

How do I set this pernamently, so that double-clicking `Colobot.app` opens the polish version?