Login screen fixed for offline mode

src/config/locales/en-US.json

@@ -203,7 +203,9 @@
     "no_internet": "No connection!",
     "confirm": "Confirm",
     "removed": "Removed",
-    "same_user": "This user already added to list"
+    "same_user": "This user already added to list",
+    "unknow_error": "An error occurred",
+    "error": "Error"
   },
   "post": {
     "reblog_alert": "Are you sure you want to reblog?",

src/screens/login/container/loginContainer.js

@@ -108,13 +108,29 @@ class LoginContainer extends PureComponent {
   };
 
   _getAccountsWithUsername = async username => {
-    const validUsers = await lookupAccounts(username);
-    return validUsers;
+    const { intl, isConnected } = this.props;
+
+    if (isConnected) {
+      return null;
+    }
+
+    try {
+      const validUsers = await lookupAccounts(username);
+
+      return validUsers;
+    } catch (error) {
+      Alert.alert(
+        intl.formatMessage({ id: 'alert.error' }),
+        intl.formatMessage({ d: 'alert.unknow_error' }),
+      );
+    }
   };
 
   _handleSignUp = () => {
+    const { intl } = this.props;
+
     Linking.openURL('https://signup.steemit.com/?ref=esteem').catch(err =>
-      alert('An error occurred', err),
+      Alert.alert(intl.formatMessage({ id: 'alert.error' }), err.message),
     );
   };
 
@@ -137,6 +153,7 @@ const mapStateToProps = state => ({
   account: state.accounts,
   notificationDetails: state.application.notificationDetails,
   notificationSettings: state.application.isNotificationOpen,
+  isConnected: state.application.isConnected,
 });
 
 export default injectIntl(connect(mapStateToProps)(LoginContainer));