I see two possible interpretations of a phrase like
English and other languages in which I'm not fluent
First, "other" could imply that the qualifier applies only to the unenumerated languages, not to English.
Second, "and other languages" could be an extended form of something like "etc." That is, the noun phrase is "English and other languages," and "in which I'm not fluent" qualifies the entire noun at once.
Is one of these more correct? Is the original example just ambiguous?