English proficiency is still required of immigrants for citizenship.
The right to vote should be, but is not, predicated on also being an informed person, in whatever is the chosen primary language.
Puerto Ricans are exposed to the English language all through their lives, it is unavoidable. That they choose not to become at least somewhat conversant in it is a serious character flaw, one that cannot be rectified in the short term.
The fact that Puerto Ricans are granted full US citizenship while residents of mainland US, also gives them full rights to exercise that citizenship, including the right to vote.
But also the responsibility to ACT like citizens. That includes being conversant with the language of the marketplace.