--> Disclaimer: WARNING! Possible CATWS spoilers <--
German --> Studied in Europe. (SSR)
French --> Taught by Gabe Jones and Jacques Dernier (Howling Commandos)
Latvarian --> Studied in present day. (SHIELD; files on Dr. Doom)
Steve tried Shawarma just once, after the battle of NYC. Since then he cannot bring himself to eat it again. (That and he prefers Gyros over Shawarma)
Drowning--He's never told anyone the truth about the what happened as he took down the HYDRA plane. Briefly the soldier had been knocked unconscious. Only to awaken to find himself pinned underneath a steel bar, that once acted as part of the frame of the craft. Steve remained awake, alert as the aircraft slowly began sinking under the thick sheet of ice. All the while the frigid water began rushing in, darkness soon to follow--until there was nothing. Frequently the soldier is plagued with nightmares of his experience.
Steve never forgave himself for not being able to save his best friend. After all the times Bucky had saved his skin--he could not do the same. Even if he won't admit it, he still thinks about it all the time.
After the downfall of SHIELD (HYDRA), Steve has made it his personal mission to find Bucky. He's willing to go to any lengths to find his childhood friend--even if it means temporarily leaving the Avengers.
Steven has always had rather strong feelings for Bucky, whether it being friendship or something more. He never had the chance to tell Buck how he really felt. (not accepted in all verses)