Add InactiveFloaterTransparency and ActiveFloaterTransparency settings

Dear Users,
This removes FloaterUnfocusedBackgroundOpaque, to achieve the same effect,
modify InactiveFloaterTransparency, 1.5 should do the trick.

PS: The settings are in the Vanity tab at the bottom.

Now for developer nonsense:
Also sync a bunch of the UI code with upstream Alchemy for opts and shtuff.
Also let's translate the tooltips on the buttons on the top right of floaters
Translators note that not all new strings have been translated yet as not all are upstream.

indra/newview/app_settings/settings.xml

@@ -1176,17 +1176,6 @@ Found in Advanced->Rendering->Info Displays</string>
       <key>Value</key>
       <integer>0</integer>
     </map>
-    <key>FloaterUnfocusedBackgroundOpaque</key>
-    <map>
-      <key>Comment</key>
-      <string>Disables floaters going transparent when not in focus, may conflict with some skins, though.</string>
-      <key>Persist</key>
-      <integer>1</integer>
-      <key>Type</key>
-      <string>Boolean</string>
-      <key>Value</key>
-      <integer>0</integer>
-    </map>
     <key>FSSynchronizeTextureMaps</key>
     <map>
       <key>Comment</key>
@@ -2577,6 +2566,17 @@ This should be as low as possible, but too low may break functionality</string>
       <key>Value</key>
       <real>300.0</real>
     </map>
+    <key>ActiveFloaterTransparency</key>
+    <map>
+      <key>Comment</key>
+      <string>Transparency of active floaters (floaters that have focus)</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>F32</string>
+      <key>Value</key>
+      <real>1</real>
+    </map>
     <key>AdvanceSnapshot</key>
     <map>
       <key>Comment</key>
@@ -9312,6 +9312,17 @@ This should be as low as possible, but too low may break functionality</string>
       <key>Value</key>
       <integer>1</integer>
     </map>
+    <key>InactiveFloaterTransparency</key>
+    <map>
+      <key>Comment</key>
+      <string>Transparency of inactive floaters (floaters that have no focus)</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>F32</string>
+      <key>Value</key>
+      <real>1</real>
+    </map>
     <key>InBandwidth</key>
     <map>
       <key>Comment</key>