Build the class name lookup from FillLocalizedClassList

Replace the hardcoded per-locale ["class"] reverse-lookup tables (localized
class name -> token) with a runtime build in GetEnvironment:

  L["class"] = tInvert(FillLocalizedClassList({}))

The client's own class list supplies the localized names for whatever locale is
running, so the tables were pure duplication -- and this also covers locales the
hardcoded tables never listed. Consumers (libunitscan, panel, socialmod) are
unchanged. Drop ["class"] from every locale file.

pfUI.lua

@@ -292,6 +292,7 @@ function pfUI:GetEnvironment()
   pfUI.env.C = pfUI_config
   pfUI.env.pfUI_throttle = _G.pfUI_throttle
   pfUI.env.L = (pfUI_locale[GetLocale()] or pfUI_locale["enUS"])
+  pfUI.env.L["class"] = pfUI.env.L["class"] or tInvert(LOCALIZED_CLASS_NAMES_MALE)
 
   return pfUI.env
 end