Earlier quoted context omitted.
It almost covers German except for ä, ö, ü and ß all of which have a very easy transliteration ae, oe, ue and ss. Similarly it almost covers Italian, French (accents can be dropped), Spanish and a couple more
That you can do transliterations doesn't make it a good idea. > French (accents can be dropped) What? No! See for example https://french.stackexchange.com/a/24410
In Italian, however, accents are only on the last letter of a word so they are usually replaced with apostrophes if your keyboard lacks them (in fact even on an Italian keyboard È is usually typed as E'; most word processors autocorrect it).