Cordova framework integration, Android support, mobile UI & options tab

Cordova integration and android platform :
- Added cordova directory with required config
- Added cordova applications generation in gulpfile
- Added cordova development instructions
- Used cordova plugins to simulate missing chrome api  plugins (chrome.serial and chrome.fileSystem)
- Added cordova clipboard support
- Added android operating system and Cordova gui mode
- Fixed some css and js files to make them working on Android as well as on computers
- Added --skipdep argument to accelerate cordova build (gulp task)
- Added a webview helper to help people to update the webview app of their device

New options tab :
- Added options tab replacing the options dropdown
- Added option to switch between phones UI and computers UI

Mobile interface and global interface improvements :
- Simplified the structure of the header with flex css
- Made headerbar and tab container responsive (compact headerbar and side menu)
- All tabs are adapted to mobile interface (except firmware flasher)
- The servos and adjustments tabs are not fully adapted but are "usable"
- Improved header bar animation
- Improved log expandation animation
- Added swipe gesture to toggle side menu

Fixes during the development :
- Logo position
- Dark mode
- Auto connection
- Error messages (cordova_chromeapi.js)
- Responsive grid
- Testing
- Disconnection
- Width of boxes inside the OSD tab
- Fixed cli tab
- OSD tab
- Motor stop switch
- White spaces in boxes
- Dialogs size
- Connect button state
- Prevent tablet with a height larger than 575px to switch to computers ui
- Fixed logging tab
- Fixed code smell
- Fixed yarn cordova plugin install issue
- Fixed content_wrapper
- Fixed vibrations when scrolling
- Fixed scrolling bar alignment
- Fixed dialogReportProblem height
- Fixed rates logo
- Fixed auto connection default value (true)
- Fixed D to D max
- Fixed dialogs

Added required messages in locales/en/messages.json file

Requested changes

src/js/localization.js

@@ -51,10 +51,12 @@ i18n.init = function(cb) {
 };
 
 i18n.changeLanguage = function(languageSelected) {
-  ConfigStorage.set({'userLanguageSelect': languageSelected});
-  i18next.changeLanguage(getValidLocale(languageSelected));
-  i18n.selectedLanguage = languageSelected;
-  GUI.log(i18n.getMessage('language_changed'));
+    if (typeof ConfigStorage !== 'undefined') {
+        ConfigStorage.set({'userLanguageSelect': languageSelected});
+    }
+    i18next.changeLanguage(getValidLocale(languageSelected));
+    i18n.selectedLanguage = languageSelected;
+    GUI.log(i18n.getMessage('language_changed'));
 };
 
 i18n.getMessage = function(messageID, parameters) {
@@ -159,17 +161,22 @@ i18n.localizePage = function(forceReTranslate) {
  * returns the current locale to the callback
  */
 function getStoredUserLocale(cb) {
-    ConfigStorage.get('userLanguageSelect', function (result) {
-        let userLanguage = 'DEFAULT';
-        if (result.userLanguageSelect) {
-            userLanguage = result.userLanguageSelect;
-        }
-        i18n.selectedLanguage = userLanguage;
+    if (typeof ConfigStorage !== 'undefined') {
+        ConfigStorage.get('userLanguageSelect', function (result) {
+            let userLanguage = 'DEFAULT';
+            if (result.userLanguageSelect) {
+                userLanguage = result.userLanguageSelect;
+            }
+            i18n.selectedLanguage = userLanguage;
 
-        userLanguage = getValidLocale(userLanguage);
+            userLanguage = getValidLocale(userLanguage);
 
+            cb(userLanguage);
+        });
+    } else {
+        const userLanguage = getValidLocale('DEFAULT');
         cb(userLanguage);
-    });
+    }
 }
 
 function getValidLocale(userLocale) {