When trying to display unicode characters in the i18n strings.xml file iOS requires a capital 'U', android requires a lowercase 'u'. If not provided the typed characters show up.
example a non breaking space with code 00A0,
\u00A0 - android
\U00A0 - iOS
no known workaround with internationalization, as it doesn't allow if/else code branches. Ideally, both would allow both.