A: On consoles, rarely. On PC (Battle.net), yes—using the options.3.cod22.cst file edit mentioned above.
If you are playing the modern Modern Warfare 2 (released 2022), the easiest way to get the English pack is through the official launcher. Many players don't realize the files are already there or can be queued easily. english language pack for call of duty modern warfare 2
Alejandro's one-liners will actually hit hard, and you'll finally hear the proper "Mission failed, we'll get 'em next time" without the weird echo delay. A: On consoles, rarely