zio fork 1.8.2b-zio7: guardian rank tag, ranks on private messages

#rank/guardian shows as G, after the staff ranks so a staff rank wins. css_psay from a player
reads "(PM) [RANK] name: message" ("(PM) name: message" without a rank group); console's is
unchanged. New lang keys sa_psay_template and sa_psay_template_norank.

README.md

@@ -15,12 +15,15 @@ from the `build-1.8.2b` tag). Changes, all marked `zio:` in the code:
   that share their IP, don't apply to them; a ban on their own SteamID still does. `@css/root`
   has it, as it has every `@css` flag.
 - Staff chat shows the sender's rank, from their highest `#rank/...` group (O, SA, A, TA, M, TM,
-  H for helper): `@message` in team chat and `css_asay` read `>[STAFF][RANK] name: message`, and
+  H for helper, G for guardian): `@message` in team chat and `css_asay` read
+  `>[STAFF][RANK] name: message`, and
   `@message` in all chat and `css_say` from a player read `[RANK] name: message` (`name: message`
   if they have no rank group). A non-staff player's `@message` in team chat reads
   `>[STAFF] name: message`, all in purple. Console's `css_say`/`css_asay` are unchanged. New lang keys
   `sa_staffchat_template`, `sa_staffsay_template`, their `_norank` variants and
   `sa_staffchat_template_player`, in `lang/en.json` only.
+- `css_psay` from a player reads `(PM) [RANK] name: message` (`(PM) name: message` without a rank
+  group); console's is unchanged. Lang keys `sa_psay_template` and `sa_psay_template_norank`.
 
 Publish with `FORGEJO_TOKEN=... ./release.sh v<ModuleVersion>` (ModuleVersion is `1.8.2b-zioN`).
 It rebuilds from the committed source and uploads `SimpleAdmin-<tag>.tar.gz` to git.zio.sh