Please consider also accents / a different sound by a cultural background but not on a different location. For example immigrants, that use a different toung e.g. turkish-german, russian-german, …
Same for non-native speakers e.g. german-english, french-english, … which might result in a very different pronounciation … (I already pointed it out at Region or dialect)
Please also ask local translators to find the right / common accents for a language, otherwise users might not be willing to select the right accent if they are unfamilar with the (too generic) labels or can’t find the right entry.