Fix some language endonyms (#17810)

Some language endonyms have been changed with #17478. I went through them and
tried to pick the one that made the more sense.

app/helpers/languages_helper.rb

@@ -108,7 +108,7 @@ module LanguagesHelper
     ml: ['Malayalam', 'മലയാളം'].freeze,
     mn: ['Mongolian', 'Монгол хэл'].freeze,
     mr: ['Marathi', 'मराठी'].freeze,
-    ms: ['Malay', 'Bahasa Malaysia'].freeze,
+    ms: ['Malay', 'Bahasa Melayu'].freeze,
     mt: ['Maltese', 'Malti'].freeze,
     my: ['Burmese', 'ဗမာစာ'].freeze,
     na: ['Nauru', 'Ekakairũ Naoero'].freeze,
@@ -117,7 +117,7 @@ module LanguagesHelper
     ne: ['Nepali', 'नेपाली'].freeze,
     ng: ['Ndonga', 'Owambo'].freeze,
     nl: ['Dutch', 'Nederlands'].freeze,
-    nn: ['Norwegian Nynorsk', 'Norsk nynorsk'].freeze,
+    nn: ['Norwegian Nynorsk', 'Norsk Nynorsk'].freeze,
     no: ['Norwegian', 'Norsk'].freeze,
     nr: ['Southern Ndebele', 'isiNdebele'].freeze,
     nv: ['Navajo', 'Diné bizaad'].freeze,