The problem is in the loading of the language in iOS.
Go to Settings > General > Language & Region > iPhone Language.
Change the language from english to any other option. After it changes, immediately change it back. The language loads again and the glitch is resolved.
Go to Settings > General > Language & Region > iPhone Language.
Change the language from english to any other option. After it changes, immediately change it back. The language loads again and the glitch is resolved.