If you enter the text "legendary" in the card searcher of the card collection panel, all the legendary cards will be shown. The same happens if you write "beast", etc.
Knowing that, my question is:
Is there a way to find weapons? Unlike finding spells by typing 'spell', 'weapon' doesn't show a list of weapons.
Best Answer
You search for weapons the same way you would search for any other type of card. You may have misspelled "weapon" or had a class selected that did not contain any weapon cards.
As stated on the Hearthstone Gamepedia page "Collection manager" (emphasis my own):
As also stated there, per @mabu's comment, the only thing not different between English and non-English clients is the deck names: