One working language understood by all Member States is a more practical way of communicating often untranslatable yet vital EU-specific vocabulary.  The EU does use technical jargon for which there is often not a direct translation. Therefore, it makes more sense to only have one name for each concept, by which that concept shall be known, in order to economize effort and to not waste time creating translations for EU-specific jargon. It is not chauvinistic, or even a matter of preference, to use English as a working language over other languages; it just so happens to be a language that is understood throughout the EU Member States. It is better and more effective to spend the time addressing the issues rather than deciding by which names to call these entities that give rise to issues within the EU.