i18n(settings): keep the game's own vocabulary, and stop duplicating a key

A review pass found the translation commit had introduced a split rather
than closed one.

Every existing string in this plugin leaves "tell" untranslated -- it is
what the game calls the thing, in twenty values across the German file
alone. My new keys translated it, so the channels tab showed "Auto-Tell-
Tabs" and, two rows below, "Flüstern automatisch öffnen". Thirteen of
fourteen sampled languages had the same break. The four affected keys
now use the established word, which also fixes a German line that had
tells "aufgehen" like a door.

Turkish said the opposite of what the control does: saydamlık is
transparency, the slider is opacity, and 1.0 means fully opaque. Every
other language uses the opacity word. Corrected, along with the inactive
one beside it.

Compact density had grown a second key for a field that already had one.
Appearance_UseCompactDensity_Name and _Description were sitting there
with no caller -- which is precisely what this cycle exists to fix -- so
the chat tab uses those and my duplicate is gone again. The German
wizard label for the same field said "Kompakter Density-Modus"; it says
the same thing as the other two now.

Also: Hungarian called a pop-out window "kiemelt" (highlighted), the
project's word is "kiugró"; German called it "ausgeklappt", which is
what a menu does; Italian and Polish had a clumsy inactive-opacity
label.

435 keys, all 25 files, no gaps, no orphans in either direction.

One claim in the previous commit was wrong and is worth stating plainly:
it said only log lines, thread names, developer tools and brand strings
remained English. The appearance tab is still English throughout -- the
theme picker, the colour editor, the font section, the live preview --
and so are parts of the database viewer, which is a documented user
command, not a developer tool. That is a separate block, not a footnote.

HellionChat/Resources/HellionStrings.ko.resx

@@ -1248,7 +1248,7 @@
     <value>크기 조절 동작</value>
   </data>
   <data name="Settings_Section_TellAutoOpen" xml:space="preserve">
-    <value>귓속말 자동 열기</value>
+    <value>텔 자동 열기</value>
   </data>
   <data name="Settings_Section_Sidebar" xml:space="preserve">
     <value>사이드바</value>
@@ -1283,12 +1283,6 @@
   <data name="Settings_General_Language_Description" xml:space="preserve">
     <value>전환하면 폰트 아틀라스를 다시 만들기 때문에 채팅이 잠시 비워집니다.</value>
   </data>
-  <data name="Settings_Chat_CompactDensity_Name" xml:space="preserve">
-    <value>좁게 표시</value>
-  </data>
-  <data name="Settings_Chat_CompactDensity_Description" xml:space="preserve">
-    <value>카드 배치를 메시지당 한 줄로 바꿉니다.</value>
-  </data>
   <data name="Settings_Chat_Clock24_Name" xml:space="preserve">
     <value>24시간제</value>
   </data>
@@ -1305,13 +1299,13 @@
     <value>입력 중에 명령어 힌트 목록을 어느 쪽에 표시할지.</value>
   </data>
   <data name="Settings_Channels_TellAutoOpenMode_Name" xml:space="preserve">
-    <value>자동 열기 방식</value>
+    <value>텔 자동 열기 방식</value>
   </data>
   <data name="Settings_Channels_TellAutoOpenMode_Description" xml:space="preserve">
-    <value>귓속말이 도착했을 때 어디에서 열릴지.</value>
+    <value>텔이 도착했을 때 어디에서 열릴지.</value>
   </data>
   <data name="Settings_Channels_TellSwitchAlways_Name" xml:space="preserve">
-    <value>귓속말마다 탭으로 전환</value>
+    <value>텔마다 탭으로 전환</value>
   </data>
   <data name="Settings_Channels_TellSwitchAlways_Description" xml:space="preserve">
     <value>그렇지 않으면 첫 통 이후 탭이 배경에서 열립니다.</value>