new lanaguage strings, synced, some warnings fixed

src/librssguard/database/mariadbdriver.h

@@ -6,6 +6,8 @@
 #include "database/databasedriver.h"
 
 class MariaDbDriver : public DatabaseDriver {
+  Q_OBJECT
+
   public:
     enum class MariaDbError {
       Ok = 0,

src/librssguard/database/sqlitedriver.h

@@ -6,6 +6,8 @@
 #include "database/databasedriver.h"
 
 class SqliteDriver : public DatabaseDriver {
+  Q_OBJECT
+
   public:
     explicit SqliteDriver(bool in_memory, QObject* parent = nullptr);
 

src/librssguard/gui/reusable/messagecountspinbox.h

@@ -6,6 +6,8 @@
 #include <QSpinBox>
 
 class MessageCountSpinBox : public QSpinBox {
+  Q_OBJECT
+
   public:
     explicit MessageCountSpinBox(QWidget* parent = nullptr);
 };