Display basic login form

lib/utils/input_utils.dart

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+/// Input utilities
+///
+/// @author Pierre HUBERT
+
+/// Check out whether a given email address is valid or not
+///
+/// Taken from https://medium.com/@nitishk72/form-validation-in-flutter-d762fbc9212c
+bool validateEmail(String value) {
+  Pattern pattern =
+      r'^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$';
+  RegExp regex = new RegExp(pattern);
+  return regex.hasMatch(value);
+}

lib/utils/intl_utils.dart

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+/// Internationalization utilities
+///
+/// @author Pierre HUBERT
+
+/// Translate a string
+///
+/// Translate a given [string] into the current language, if available
+String tr(String string) {
+  //TODO : create translation system
+  return string;
+}