FIX - complete phone locale fallback

Resolve configured and regional locales through a centralized English fallback for Lua and NUI consumers. Complete the German and English app translation keys, localize remaining picker and attachment copy, and add contract tests that detect missing locale entries.

sky_phone/source/server/easyshare.lua

@@ -263,7 +263,7 @@ local function canonical_crewlink_invite(device, invite_code)
     if not group then
         return nil
     end
-    local locale = (Locales[Config.Bridge.Locale] or Locales["en"]).Phone.Apps.crewlink
+    local locale = SkyPhoneLocales.Resolve(Config.Bridge.Locale).Nui.Apps.crewlink
     local title = locale.shareInviteTitle:gsub("{group}", function() return group.name end)
     local copy_text = locale.shareInviteBody
         :gsub("{code}", function() return group.invite_code end)

sky_phone/source/server/fliptok.lua

@@ -914,7 +914,7 @@ Bridge.Callbacks.Register("sky_phone:fliptok:delete", function(source, data)
 end)
 
 RegisterCommand(Config.FlipTok.VerifyCommand, function(source, arguments)
-    local command_locale = (Locales[Config.Bridge.Locale] or Locales["en"]).FlipTokCommand
+    local command_locale = SkyPhoneLocales.Resolve(Config.Bridge.Locale).FlipTokCommand
     local function command_message(template, values)
         return template:gsub("{(%w+)}", function(key) return values[key] or "" end)
     end

sky_phone/source/server/picstagram.lua

@@ -1435,7 +1435,7 @@ Bridge.Callbacks.Register("sky_phone:picstagram:admin-resolve-report", function(
 end)
 
 RegisterCommand(Config.Picstagram.VerifyCommand, function(source, args)
-    local command_locale = (Locales[Config.Bridge.Locale] or Locales["en"]).PicstagramCommand
+    local command_locale = SkyPhoneLocales.Resolve(Config.Bridge.Locale).PicstagramCommand
     local function command_message(template, values)
         return template:gsub("{(%w+)}", function(key)
             return values[key] or ""