I came across this website totally be accident…but what an amazing find!
www.typeit.org lets you type in special characters with diacritics (accent markings, umlauts, etc.) in several different languages…I think they have all the European languages available on LingQ covered.
It’s a very convenient tool as you just type in the text into a window where you can click on the individual characters with diacritics to insert them, or use hotkeys like Ctrl + e to get “é” por ejemplo 
Please do check it out. It’s way easier than using a character map on windows or remembering all the Unicode shortcuts