Use same kind of semicolon in both totem and totem-help
The following strings contains "∶" and ":". They look the same but they are not. Totem itself uses "∶" and help uses ":". I suggest picking one and use that in all 6 strings.
https://gitlab.gnome.org/GNOME/totem/-/blob/master/data/totem.ui#L64-74
4∶3 (TV)
16∶9 (Widescreen)
2.11∶1 (DVB)
https://gitlab.gnome.org/GNOME/totem/-/blob/master/help/C/view-zoom.page#L50-52
<gui>4:3 (TV)</gui>
<gui>16:9 (Widescreen)</gui>
<gui>2.11:1 (DVB)</gui>