feat(chat): insert map-flag and item-link tokens again, and finish the resx parity

The two menu items went out with the v1.5.6 chat window in cf4705e.
Their strings stayed, in the base file only, so the feature was gone and
its labels were untranslated in all 24 other languages.

They live in the chat context menu now, next to hide-chat, which is
where the rest of that window's items ended up. The game expands <flag>
and <item> at send time, so appending the literal token is the whole
implementation; each entry is disabled while its precondition is missing
so a token cannot be sent only to expand into nothing at the other end.

ChatLog_ScrollToBottom_Tooltip is the one that stings: it has had a
caller since v1.9.0 and existed in the base file alone, so every player
outside English read that tooltip in English.

All three are translated now, and with them the resource files are at
full parity for the first time -- 25 files, every key in every one.

HellionChat/Resources/HellionStrings.ko.resx

@@ -1205,4 +1205,13 @@
   <data name="Settings_NotifyFailedTell_Description" xml:space="preserve">
     <value>게임은 귓속말 실패를 로그에만 표시합니다. 이 설정은 대신 알림을 띄워, 오프라인이거나 다른 월드에 있는 상대에게 보낸 메시지를 놓치지 않게 합니다.</value>
   </data>
+  <data name="ChatLog_ScrollToBottom_Tooltip" xml:space="preserve">
+    <value>최신 메시지로 이동</value>
+  </data>
+  <data name="ChatLog_Insert_MapFlag" xml:space="preserve">
+    <value>지도 표시 삽입 &lt;flag&gt;</value>
+  </data>
+  <data name="ChatLog_Insert_ItemLink" xml:space="preserve">
+    <value>연결된 아이템 삽입 &lt;item&gt;</value>
+  </data>
 </root>