I'll let you into a little secret - we were all greenhorns once
Stick your national flag on your pack alongside one of Ivar's shell patches. If people can't understand you (or vice versa) smile sweetly and point to the patches.
Download the Google Translate app for French, Spanish and possibly Galician including the off line dictionaries. You can always type out what you want to say and even have "conversations" - you type in English they type in French or Spanish. You can even speak or take a photo (of a sign maybe) and it translates.
Remember, it's an Adventure - you're
supposed to be out of your comfort zone!
Buen Camino!