Add new Kiwix icon

AndroidManifest.xml

@@ -17,7 +17,7 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 
     <application
-            android:icon="@drawable/kiwix_icon"
+            android:icon="@mipmap/kiwix_icon"
             android:label="@string/app_name"
             android:allowBackup="true"
             android:hardwareAccelerated="true"
@@ -89,7 +89,6 @@
 
         <activity
                 android:name=".ZimFileSelectActivity"
-                android:icon="@drawable/kiwix_icon"
                 android:label="@string/choose_file">
             <!-- TODO -->
             <intent-filter>

src/org/kiwix/kiwixmobile/KiwixMobileActivity.java

@@ -258,6 +258,7 @@ public class KiwixMobileActivity extends AppCompatActivity
         manageExternalLaunchAndRestoringViewState(savedInstanceState);
         setUpWebView();
         setUpExitFullscreenButton();
+        setUpTTS();
         loadPrefs();
         updateTitle(ZimContentProvider.getZimFileTitle());
     }
@@ -1320,7 +1321,7 @@ public class KiwixMobileActivity extends AppCompatActivity
                                 this);
                         zimFileMissingBuilder.setTitle(R.string.app_name);
                         zimFileMissingBuilder.setMessage(R.string.customapp_missing_content);
-                        zimFileMissingBuilder.setIcon(R.drawable.kiwix_icon);
+                        zimFileMissingBuilder.setIcon(R.mipmap.kiwix_icon);
                         final Activity activity = this;
                         zimFileMissingBuilder
                                 .setPositiveButton(getString(R.string.go_to_play_store),