Add about dialog

lib/utils/ui_utils.dart

@@ -31,10 +31,9 @@ Widget buildLoadingPage({
 }
 
 /// Build and return an error card
-Widget buildErrorCard(String message, {List<Widget> actions, bool hide = false}) {
-
-  if(hide)
-    return Container();
+Widget buildErrorCard(String message,
+    {List<Widget> actions, bool hide = false}) {
+  if (hide) return Container();
 
   return Card(
     elevation: 2.0,
@@ -190,3 +189,23 @@ const darkerAccentColor = Colors.white30;
 
 /// Check out whether dark theme is enabled or not
 bool darkTheme() => preferences().getBool(PreferencesKeyList.ENABLE_DARK_THEME);
+
+/// Show about Comunic dialog
+void showAboutAppDialog(BuildContext context) {
+  showAboutDialog(
+      context: context,
+      applicationName: "Comunic",
+      children: <Widget>[
+        Text(
+          tr("Comunic is a free and OpenSource social network that respect your privacy."),
+          textAlign: TextAlign.center,
+        ),
+        SizedBox(
+          height: 20,
+        ),
+        Text(
+          "Application built by Pierre Hubert",
+          textAlign: TextAlign.center,
+        ),
+      ]);
+}