Trim Stab that is completely besides the point. Yes it is a happy coincidence that the language of aviation is English and that has fortunately led to monolingual people such as myself being able to have a foothold in the industry but there needs to be standardisation. The rights of a native of any one particular country to be able to fly around his country speaking just their native language are not sacrosanct and are quite frankly irrelevant.
The cold hard fact is that multiple languages on an R/T frequency significantly degrades situational awareness for those not fluent in the language concerned. This has DIRECTLY caused incidents and been responsible for loss of lives and continues to have the potential to do so. How you can overlook this is beyond belief. It's small minded and petty to regard it as a laziness issue when in fact it is a critical safety issue irrelevant to what languages people studied at school.