The fish mobs are missing their translation strings

How to reproduce

• Summon all types of fish:

  /summon cod
  /summon salmon
  

• Note that it'll say "Summoned new entity.minecraft.<mob_id>" instead of the translated name.

How to fix

This can easily be fixed by adding these lines to the lang file:

(MC-123540)

"entity.minecraft.cod": "Cod",
"entity.minecraft.salmon": "Salmon"

Side note:
remove

"entity.minecraft.cod_mob": "Cod",
"entity.minecraft.salmon_mob": "Salmon"