gui: move "(Up A Level)" in file selector to resource string

Doing it at display time is easier.

Change-Id: Ic0f2ca1f425f6267452157524a05b51d9324be16
diff --git a/gui/fileselector.cpp b/gui/fileselector.cpp
index 23f235c..9275d97 100644
--- a/gui/fileselector.cpp
+++ b/gui/fileselector.cpp
@@ -31,8 +31,6 @@
 #include "../data.hpp"
 #include "../twrp-functions.hpp"
 
-#define TW_FILESELECTOR_UP_A_LEVEL "(Up A Level)"
-
 int GUIFileSelector::mSortOrder = 0;
 
 GUIFileSelector::GUIFileSelector(xml_node<>* node) : GUIScrollList(node)
@@ -186,9 +184,9 @@
 		return -1;
 	if (d2.fileName == ".")
 		return 0;
-	if (d1.fileName == TW_FILESELECTOR_UP_A_LEVEL)
+	if (d1.fileName == "..")
 		return -1;
-	if (d2.fileName == TW_FILESELECTOR_UP_A_LEVEL)
+	if (d2.fileName == "..")
 		return 0;
 
 	switch (mSortOrder) {
@@ -251,12 +249,8 @@
 			continue;
 		if (data.fileName == ".." && folder == "/")
 			continue;
-		if (data.fileName == "..") {
-			data.fileName = TW_FILESELECTOR_UP_A_LEVEL;
-			data.fileType = DT_DIR;
-		} else {
-			data.fileType = de->d_type;
-		}
+
+		data.fileType = de->d_type;
 
 		std::string path = folder + "/" + data.fileName;
 		stat(path.c_str(), &st);
@@ -272,7 +266,7 @@
 			data.fileType = TWFunc::Get_D_Type_From_Stat(path);
 		}
 		if (data.fileType == DT_DIR) {
-			if (mShowNavFolders || (data.fileName != "." && data.fileName != TW_FILESELECTOR_UP_A_LEVEL))
+			if (mShowNavFolders || (data.fileName != "." && data.fileName != ".."))
 				mFolderList.push_back(data);
 		} else if (data.fileType == DT_REG || data.fileType == DT_LNK || data.fileType == DT_BLK) {
 			if (mExtn.empty() || (data.fileName.length() > mExtn.length() && data.fileName.substr(data.fileName.length() - mExtn.length()) == mExtn)) {
@@ -319,6 +313,8 @@
 	if (itemindex < folderSize) {
 		text = mFolderList.at(itemindex).fileName;
 		icon = mFolderIcon;
+		if (text == "..")
+			text = gui_lookup("up_a_level", "(Up A Level)");
 	} else {
 		text = mFileList.at(itemindex - folderSize).fileName;
 		icon = mFileIcon;
@@ -345,7 +341,7 @@
 
 			// Ignore requests to do nothing
 			if (str == ".")	 return;
-			if (str == TW_FILESELECTOR_UP_A_LEVEL) {
+			if (str == "..") {
 				if (cwd != "/") {
 					size_t found;
 					found = cwd.find_last_of('/');