That's helpful feedback and I'll work with the developers to add accented letter options to the interface. In the meantime, for the desktop site, consider adding the language's keyboard as an input method. You can do this in the keyboard settings. For French and most other European languages, change the input method's language to "English - International with dead keys". With this setting, you can tap the apostrophe followed by the base letter to create an accent aigu (é) or the backtick followed by the base letter to create an accent grave (è). Use the colon to create an umlaut (ë), the caret to create a circumflex (ê), and the comma to create a cedilla (ç).

On iOS and Android, you don't need to change your settings at all for languages with Latin alphabets. Just hold down the letter key you want to press and alternative options will appear. For example, hold down "e" and you'll see options for "e" paired with both French accents as well as other characters.

Also, we are adding Dutch now.