Builds the option list for a roll-visibility <select>: each SoHL speaker
roll-mode value paired with its localized CHAT.MODES.* label key (see
CHAT_MODE_LABEL_BY_ROLL_MODE). The value is the stored roll-mode
value (e.g. "publicroll") so the selection round-trips correctly; the
label is a localization key resolved by the template's localize=true.
Builds the option list for a roll-visibility
<select>: each SoHL speaker roll-mode value paired with its localizedCHAT.MODES.*label key (see CHAT_MODE_LABEL_BY_ROLL_MODE). Thevalueis the stored roll-mode value (e.g."publicroll") so the selection round-trips correctly; thelabelis a localization key resolved by the template'slocalize=true.