[fix] fix bad label "ok" on startup message box

Add qdesigner dialog with Sakia version and a cancel button
Update translation

src/sakia/gui/dialogs/startup.ui

+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>StartupDialog</class>
+ <widget class="QDialog" name="StartupDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>362</width>
+    <height>95</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Sakia</string>
+  </property>
+  <widget class="QWidget" name="horizontalLayoutWidget">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>10</y>
+     <width>341</width>
+     <height>81</height>
+    </rect>
+   </property>
+   <layout class="QHBoxLayout" name="horizontalLayout">
+    <item>
+     <widget class="QLabel" name="label_3">
+      <property name="maximumSize">
+       <size>
+        <width>50</width>
+        <height>50</height>
+       </size>
+      </property>
+      <property name="text">
+       <string/>
+      </property>
+      <property name="pixmap">
+       <pixmap resource="../../../../res/icons/sakia.icons.qrc">:/icons/sakia_logo</pixmap>
+      </property>
+      <property name="scaledContents">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <layout class="QVBoxLayout" name="verticalLayout">
+      <item alignment="Qt::AlignHCenter">
+       <widget class="QLabel" name="label">
+        <property name="font">
+         <font>
+          <pointsize>11</pointsize>
+         </font>
+        </property>
+        <property name="text">
+         <string>Connecting to the network
+please wait...</string>
+        </property>
+        <property name="alignment">
+         <set>Qt::AlignCenter</set>
+        </property>
+       </widget>
+      </item>
+      <item alignment="Qt::AlignHCenter">
+       <widget class="QPushButton" name="cancelButton">
+        <property name="enabled">
+         <bool>true</bool>
+        </property>
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+          <horstretch>0</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+        <property name="text">
+         <string>Cancel</string>
+        </property>
+        <property name="autoDefault">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+   </layout>
+  </widget>
+ </widget>
+ <resources>
+  <include location="../../../../res/icons/sakia.icons.qrc"/>
+ </resources>
+ <connections/>
+</ui>

src/sakia/main.py

@@ -5,8 +5,8 @@ import signal
 import sys
 import traceback
 
-from PyQt5.QtCore import Qt
-from PyQt5.QtWidgets import QApplication, QMessageBox
+from PyQt5.QtCore import Qt, QObject, QCoreApplication
+from PyQt5.QtWidgets import QApplication, QMessageBox, QDialog, QPushButton, QLabel
 
 from duniterpy.api.errors import DuniterError
 from sakia.helpers import single_instance_lock, cleanup_lock
@@ -17,6 +17,24 @@ from sakia.gui.dialogs.connection_cfg.controller import ConnectionConfigControll
 from sakia.gui.main_window.controller import MainWindowController
 from sakia.gui.preferences import PreferencesDialog
 from sakia.gui.widgets import QAsyncMessageBox
+from sakia.gui.dialogs.startup_uic import Ui_StartupDialog
+from sakia import __version__
+
+
+class StartupDialog(QDialog, Ui_StartupDialog):
+    def __init__(self):
+        super().__init__()
+        self.setupUi(self)
+        self.setWindowTitle("Sakia {version}".format(version=__version__))
+
+    def closeEvent(self, event):
+        """
+        Overide close event to exit application if dialog is closed
+
+        :param QDialogEvent event:
+        :return:
+        """
+        cancel_connection()
 
 
 def exit_exception_handler(loop, context):
@@ -121,6 +139,17 @@ def exception_message(log_lines, exc_info):
     mb.exec()
 
 
+def cancel_connection(button=None):
+    """
+    Exit application
+
+    :param QMessageBox button: Clicked button or None if close event
+    :return:
+    """
+    print("Cancel connection! Exited.")
+    sys.exit(0)
+
+
 def main():
     #  activate ctrl-c interrupt
     signal.signal(signal.SIGINT, signal.SIG_DFL)
@@ -149,14 +178,9 @@ def main():
         keep_trying = True
         while not app.blockchain_service.initialized():
             try:
-                box = QMessageBox()
-                box.setWindowTitle("Initialization")
-                box.setText("Connecting to the network...")
-                wFlags = box.windowFlags()
-                if Qt.WindowCloseButtonHint == (wFlags & Qt.WindowCloseButtonHint):
-                    wFlags = wFlags ^ Qt.WindowCloseButtonHint
-                    box.setWindowFlags(wFlags)
+                box = StartupDialog()
                 box.show()
+                box.cancelButton.clicked.connect(cancel_connection)
                 loop.run_until_complete(app.initialize_blockchain())
                 box.hide()
             except (DuniterError, NoPeerAvailable) as e: