Do you mean that the agreement message will not work for multilingual site since only 1 language can be used? In that case, I will log this in our tracker so we can make the field multilingual friendly.
You can actually translate this by using a translation text in the settings and then add the translation in your respective language files. For instance, in the settings, you can just add "COM_EB_SOME_TRANSLATION_MESSAGE" and add the following in your language files.
COM_EB_SOME_TRANSLATION_MESSAGE="Some translation in your language file"