Make tab splitter menu and incremental search translatable

Rename menu IDs in tab splitter to be in English.
Relocate some controls in incremental search dialog to ease translation.

Fix #8955, close #9496

PowerEditor/installer/nativeLang/english.xml

@@ -1359,6 +1359,8 @@ Find in all files except exe, obj && log:
             <common-name value="Name: "/>
             <tabrename-title value="Rename Current Tab"/>
             <tabrename-newname value="New Name: "/>
+            <splitter-rotate-left value="Rotate to left"/>
+            <splitter-rotate-right value="Rotate to right"/>
             <recent-file-history-maxfile value="Max File: "/>
             <language-tabsize value="Tab Size: "/>
             <userdefined-title-new value="Create New Language..."/>

PowerEditor/src/WinControls/SplitterContainer/SplitterContainer.cpp

@@ -17,6 +17,8 @@
 #include <stdexcept>
 #include <windows.h>
 #include "SplitterContainer.h"
+#include "Parameters.h"
+#include "localization.h"
 #include <cassert>
 
 
@@ -179,12 +181,12 @@ LRESULT SplitterContainer::runProc(UINT message, WPARAM wParam, LPARAM lParam)
 		{
 			switch (LOWORD(wParam))
 			{
-				case ROTATION_A_GAUCHE:
+				case ROTATION_LEFT:
 				{
 					rotateTo(DIRECTION::LEFT);
 					break;
 				}
-				case ROTATION_A_DROITE:
+				case ROTATION_RIGHT:
 				{
 					rotateTo(DIRECTION::RIGHT);
 					break;
@@ -240,8 +242,15 @@ LRESULT SplitterContainer::runProc(UINT message, WPARAM wParam, LPARAM lParam)
 				if (!_hPopupMenu)
 				{
 					_hPopupMenu = ::CreatePopupMenu();
-					::InsertMenu(_hPopupMenu, 1, MF_BYPOSITION, ROTATION_A_GAUCHE, TEXT("Rotate to left"));
-					::InsertMenu(_hPopupMenu, 0, MF_BYPOSITION, ROTATION_A_DROITE, TEXT("Rotate to right"));
+
+					NativeLangSpeaker* nativeLangSpeaker = NppParameters::getInstance().getNativeLangSpeaker();
+					const generic_string textLeft =
+						nativeLangSpeaker->getLocalizedStrFromID("splitter-rotate-left", TEXT("Rotate to left"));
+					const generic_string textRight =
+						nativeLangSpeaker->getLocalizedStrFromID("splitter-rotate-right", TEXT("Rotate to right"));
+
+					::InsertMenu(_hPopupMenu, 1, MF_BYPOSITION, ROTATION_LEFT, textLeft.c_str());
+					::InsertMenu(_hPopupMenu, 0, MF_BYPOSITION, ROTATION_RIGHT, textRight.c_str());
 				}
 
 				::TrackPopupMenu(_hPopupMenu, TPM_LEFTALIGN, p.x, p.y, 0, _hSelf, NULL);

PowerEditor/src/WinControls/SplitterContainer/SplitterContainer.h

@@ -20,8 +20,8 @@
 
 #define SPC_CLASS_NAME TEXT("splitterContainer")
 
-#define ROTATION_A_GAUCHE 2000
-#define ROTATION_A_DROITE 2001
+#define ROTATION_LEFT 2000
+#define ROTATION_RIGHT 2001
 
 
 enum class DIRECTION