Fix a typo ("No body" should be "Nobody")
Harmonize the meaning of "view" vs "show" this task

"View this task" was used only once, for the same action as "Show this task".
However, "View this task" is more accurate: it implies the notion of "sight"
instead of the possible connotation of "revealing"/"unhiding".

Also simplify the French translation accordingly.
Make "Nobody assigned" labels less prominent to reduce visual clutter