For my current Awards-plugin, I want to give the possibility to use other languages then the currently hardcoded English.
Where am I to put the language constants? In the CB-lang file?
But then, everyone installing the plugin has to copy and paste the needed definitions before using, doesn't he?

best way is to include a language directory as part of your plugin and then check which language is set in joomla and access tha file. There are lots of examples of this in components. Hope that helps

You're right, maybe that's the best thing. Because my plugin comes along with a small component, I'll put it the language there.
But for other plugins, maybe some standard way to proceed would be nice. Maybe including an extra file for each cb-plugin from the corresponding lang-folder? (with the name of the plugin)