Unicode content in some configuration fields

Depending on the user's note type(s), last_mass_dest, last_mass_source,
and/or templater_field may contain unicode characters, requiring that
these three configuration columns be marked as such.
Various copy improvements

Adds additional explanations about note updates, improves tooltips, adds
a disclaimer about phrase length to Google, and makes Ctrl+T (Cmd+T)
shortcut available consistently.