ONEGram Premium is a third-party Telegram client with not many but useful customizations.
Appearance
Use your avatar as menu header background, use system fonts or custom emojis, let status bar be transparent, hide phone number…
chats
Set the size of the stickers: larger or smaller, show folders when forwarding, automatically pause the video when the application is changed or the device is locked …
Translator
Translate messages and articles, with 5 translation engines to choose from. Press and hold TRANSLATE to change the language you want to translate the text into.
More
The above is just a small part of the features, for more features, you can download and check it out.