The author who created the most details for the Mandalorian culture established in Star Wars Insider #86: "There is no Mandalorian word for hero. Heroic behavior is expected of both genders: it's not exceptional."
However, the author also had a few Mando characters in the novels refer to certain people as a "hero" in Galactic Basic. A likely possibility is that author meant that Mandos do not have a word that means "idol," "icon," or "paragon." Instead, Mandalorians have the option to use a number of Mando'a words for describing characteristics that make a person a "hero." Thus, when translating this concept, choose the words the best describe why the person should be considered a "hero."
Adjectives
atin: stubborn, tenacious, capable of endurance
atin'la: tough
cyare: beloved, popular
haamyc: unusual
jaon'yc: important
kotep: brave
kotyc: strong
kandosii: indomitable, ruthless
kandosii'la: stunning, amazing
nehutyc: feisty, gutsy
or'atin'la: very tough
ori'beskaryc: hard case, extremely tough, no-nonsense
ori'kandosii: very ruthless
ori'mando: very mandalorian
mirdala: clever
par'jila: triumphant
ramikadyc: very ruthless
Nouns
atin'ad: tough person
jai'galaarla sur'haaise: shriek-hawk eyes - worn as a mark of honor for exceptional actions
kote: glory
mirshko: courage
ori'ramikad: supercommando
jatne'buir: best parent
Verb
tal'onidir: to sweat blood - idiom for going that extra mile or making an all-out effort