feat(app): supports translations

tests/languages/en.ts

+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1">
+<context>
+    <name>main_window</name>
+    <message>
+        <source>helloWorld</source>
+        <translation>Hello World!</translation>
+    </message>
+</context>
+</TS>

tests/languages/fr.ts

+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE TS>
+<TS version="2.1">
+<context>
+    <name>main_window</name>
+    <message>
+        <source>helloWorld</source>
+        <translation>Bonjour le monde !</translation>
+    </message>
+</context>
+</TS>

tests/linphone.pro

@@ -4,11 +4,22 @@ TARGET = linphone
 TEMPLATE = app
 
 SOURCES += \
+  src/app.cpp \
   src/main.cpp \
   src/views/main_window.cpp
 
 HEADERS += \
-  src/views/main_window.h
+  src/app.hpp \
+  src/views/main_window.hpp
+
+TRANSLATIONS = \
+  languages/en.ts \
+  languages/fr.ts
+
+lupdate_only{
+  SOURCES = \
+    ui/*.qml
+}
 
 RESOURCES += \
   resources.qrc

tests/resources.qrc

 <!DOCTYPE RCC><RCC version="1.0">
 <qresource prefix="/">
+  <!-- Languages. -->
+  <file>languages/en.qm</file>
+  <file>languages/fr.qm</file>
+
+  <!-- UI. -->
   <file>ui/main_window.qml</file>
 </qresource>
 </RCC>

tests/src/app.cpp

+#include <cstdlib>
+
+#include <QtDebug>
+
+#include "app.hpp"
+
+#define LANGUAGES_PATH ":/languages/"
+
+App::App(int &argc, char **argv) : QGuiApplication(argc, argv) {
+  // Try to enable system translation by default. (else english)
+  if (m_translator.load(QString(LANGUAGES_PATH) + QLocale::system().name()) ||
+      m_translator.load(LANGUAGES_PATH "en")) {
+    this->installTranslator(&m_translator);
+  } else {
+    qWarning() << "No translation found.";
+  }
+}

tests/src/app.hpp

+#ifndef APP_H_
+#define APP_H_
+
+#include <QGuiApplication>
+#include <QTranslator>
+
+class App : public QGuiApplication {
+public:
+  App (int &argc, char **argv);
+  virtual ~App () {}
+
+private:
+  QTranslator m_translator;
+};
+
+#endif // APP_H_

tests/src/main.cpp

 #include <cstdlib>
 
-#include <QGuiApplication>
 #include <QQmlApplicationEngine>
 
+#include "app.hpp"
+
 int main (int argc, char *argv[]) {
-  QGuiApplication app(argc, argv);
+  // Init main window.
+  App app(argc, argv);
   QQmlApplicationEngine engine(QUrl("qrc:/ui/main_window.qml"));
 
+  // File not found.
   if (engine.rootObjects().isEmpty())
     exit(EXIT_FAILURE);
 

tests/src/views/main_window.cpp

-#include "main_window.h"
+#include "main_window.hpp"

tests/src/views/main_window.h → tests/src/views/main_window.hpp

 #ifndef MAIN_WINDOW_H
 #define MAIN_WINDOW_H
 
-
 #endif // MAIN_WINDOW

tests/ui/main_window.qml

 import QtQuick 2.5
-import QtQuick.Window 2.2
+import QtQuick.Controls 2.0
+import QtQuick.Layouts 1.3
 
-Window {
+ApplicationWindow {
+    id: mainWindow
     visible: true
-    width: 800
-    height: 600
+
+    header: ToolBar {
+        RowLayout {
+            anchors.fill: parent
+        }
+    }
+
+    footer: TabBar {
+
+    }
 
     Text {
         anchors.centerIn: parent
-        text: "Hello World!"
+        text: qsTr("helloWorld");
     }
 }