Fix a bunch of messages

* Find and rename/remove duplicate string variable names
* Add missing string variables to en language file
* Fix display of some strings missing @ in front of variable name
* Fix several %s --> {1}
* Be consistent in usage of cancelled vs. canceled (both spellings
  acceptable)

Tip for finding strings missing from language files:

1) Find all messages:
egrep -hr "gui_msg.+=" > /tmp/msgs.txt

2) Regex replace to trim them down
WHAT: ^\s+gui_msg(?:[^"]+)"([a-zA-Z0-9_]+)=([^"]+).+
WITH: $1
Note that $2 can be used to retain the message

3) Find missing strings:
for i in $(cat /tmp/msgs.txt); do
    if ! grep -q $i gui/theme/common/languages/en.xml; then
        echo $i;
    fi
done

Change-Id: Ic193162e4b5468bf027472928a370be39840ea1d
diff --git a/partition.cpp b/partition.cpp
index a8de4a9..71d6f22 100644
--- a/partition.cpp
+++ b/partition.cpp
@@ -1141,7 +1141,7 @@
 	string Layout_Filename = Mount_Point + "/.layout_version";
 
 	if (!Can_Be_Wiped) {
-		gui_msg(Msg(msg::kError, "cannot_wipe=Partition {1} cannot be wiped.\n")(Display_Name));
+		gui_msg(Msg(msg::kError, "cannot_wipe=Partition {1} cannot be wiped.")(Display_Name));
 		return false;
 	}
 
@@ -1480,7 +1480,7 @@
 bool TWPartition::Restore(string restore_folder, const unsigned long long *total_restore_size, unsigned long long *already_restored_size) {
 	string Restore_File_System;
 
-	TWFunc::GUI_Operation_Text(TW_RESTORE_TEXT, Display_Name, gui_parse_text("{@restoring}"));
+	TWFunc::GUI_Operation_Text(TW_RESTORE_TEXT, Display_Name, gui_parse_text("{@restoring_hdr}"));
 	LOGINFO("Restore filename is: %s\n", Backup_FileName.c_str());
 
 	Restore_File_System = Get_Restore_File_System(restore_folder);
@@ -2048,7 +2048,7 @@
 	tw_set_default_metadata(Full_FileName.c_str());
 	if (TWFunc::Get_File_Size(Full_FileName) == 0) {
 		// Actual size may not match backup size due to bad blocks on MTD devices so just check for 0 bytes
-		gui_msg(Msg(msg::kError, "backup_size=Backup file size for '%s' is 0 bytes.")(Full_FileName));
+		gui_msg(Msg(msg::kError, "backup_size=Backup file size for '{1}' is 0 bytes.")(Full_FileName));
 		return false;
 	}
 	return true;
@@ -2107,7 +2107,7 @@
 				return false;
 		}
 	}
-	TWFunc::GUI_Operation_Text(TW_RESTORE_TEXT, Backup_Display_Name, gui_parse_text("{@restore}"));
+	TWFunc::GUI_Operation_Text(TW_RESTORE_TEXT, Backup_Display_Name, gui_parse_text("{@restoring_hdr}"));
 	gui_msg(Msg("restoring=Restoring {1}...")(Backup_Display_Name));
 
 	if (!Mount(true))
@@ -2155,7 +2155,7 @@
 	double display_percent, progress_percent;
 	char size_progress[1024];
 
-	TWFunc::GUI_Operation_Text(TW_RESTORE_TEXT, Backup_Display_Name, gui_parse_text("{@restore}"));
+	TWFunc::GUI_Operation_Text(TW_RESTORE_TEXT, Backup_Display_Name, gui_parse_text("{@restoring_hdr}"));
 	gui_msg(Msg("restoring=Restoring {1}...")(Backup_Display_Name));
 	Full_FileName = restore_folder + "/" + Backup_FileName;