The Spanish speaking press is back on forth on this. In my general experience in Mexico and in Spanish-speaking US television, teams names are translated. Current, topical Google News examples:
Mexico Example 1
Mexico Example 2
However moving on to Venezuela…
Venezuela Example (We see that they don’t translate the names.)
Now checking the Univision website, it would appear they don’t translate:
I’d’ve sworn they did, but home market, so it makes sense that they don’t.
There are even national inconsistencies: here’s another Venezuelan example where the teams names are translated.
FWIW, any time I speak with my in-laws in Mexico, they invariably speak with the translated names.