Use correct "tr" call for translating dive mode names

Correctly use gettextFromC::instance()->tr(); instead of a simple
tr(); to translate the dive mode names.
This goes on top of 0bc9edf855
and finally makes the whole thing work.

Signed-off-by: Stefan Fuchs <sfuchs@gmx.de>

qt-models/diveplannermodel.cpp

@@ -7,6 +7,7 @@
 #include "core/device.h"
 #include "core/qthelper.h"
 #include "core/subsurface-qt/SettingsObjectWrapper.h"
+#include "core/gettextfromc.h"
 #include <QApplication>
 #include <QTextDocument>
 #include <QtConcurrent>
@@ -252,7 +253,7 @@ QVariant DivePlannerPointsModel::data(const QModelIndex &index, int role) const
 			else
 				return p.time / 60;
 		case DIVEMODE:
-			return QString(tr(divemode_text_ui[p.divemode]));
+			return gettextFromC::instance()->tr(divemode_text_ui[p.divemode]);
 		case GAS:
 			/* Check if we have the same gasmix two or more times
 			 * If yes return more verbose string */

qt-models/models.cpp

@@ -7,6 +7,7 @@
  */
 #include "qt-models/models.h"
 #include "core/qthelper.h"
+#include "core/gettextfromc.h"
 
 #include <QLocale>
 
@@ -83,7 +84,7 @@ void DiveTypeSelectionModel::repopulate()
 {
 	QStringList modes = QStringList();
 	for (int i = 0; i < FREEDIVE; i++)
-		modes.append(QString(tr(divemode_text_ui[i])));
+		modes.append(gettextFromC::instance()->tr(divemode_text_ui[i]));
 	setStringList(modes);
 }