fix(l10n): em-dash sweep across EN source and translations, backfill Crowdin gap

- HellionStrings.resx: 10 in-prose em-dashes -> period/colon per style guide
- 18 HellionStrings.<lang>.resx: 114 mechanical em-dash edits via heuristic
    (period before capital, colon otherwise). Skipped: fr (already clean),
    zh-Hans/zh-Hant (already clean), ru/uk (em-dash is orthographic norm)
- HellionStrings.de.resx: fix substantive-heuristic miss in Wizard_Cancel_Label
- Language.de.resx: add Hellion Forge maintainer header (native-maintained)
- Backfill the 4 post-Crowdin keys (Options_ColorSelectedInputChannelButton_*,
    Options_HideInNewGamePlusMenu_*) into 13 legacy Crowdin locales with
    per-key AI-assisted comment marker. All 23 Language.*.resx now at 456 keys.

HellionChat/Resources/HellionStrings.ca.resx

@@ -223,7 +223,7 @@
     <value>Torna a mostrar l'assistent</value>
   </data>
   <data name="Wizard_Cancel_Label" xml:space="preserve">
-    <value>Més tard — conserva els valors per defecte</value>
+    <value>Més tard: conserva els valors per defecte</value>
   </data>
   <data name="Wizard_Cancel_Tooltip" xml:space="preserve">
     <value>Tanca l'assistent sense seleccionar cap perfil. Els valors per defecte del plugin seguiran actius i l'assistent tornarà a aparèixer en la propera càrrega del plugin.</value>