In French, Spain is “Espagne”. On the website, in the Compare menu in French, if you search for “Espagne”, it doesn’t work (1st screenshot below). But if you search for “Spain”, the website finds the correct answer… and shows “Espagne” (2nd screenshot). Same problem with Germany/Allemagne. Therefore you must search for English names even if the website is in another language. It could be confusing for new users.
It’s not a bug, but how this particular search window works (I created a bug report years ago about the same thing), it only will search if you write things in English, but will display them in your language sometimes.