refractor: login module (#283)

* Refractor components.
* Shift language and footer component to shared module.
* Replace mat-icons by font-awesome icons.
* Add comments.

Fixes #284

src/app/shared/footer/footer.component.ts

@@ -0,0 +1,25 @@
+/** Angular Imports */
+import { Component, OnInit } from '@angular/core';
+
+/** Environment Configuration */
+import { environment } from 'environments/environment';
+
+/**
+ *  Footer component.
+ */
+@Component({
+  selector: 'mifosx-footer',
+  templateUrl: './footer.component.html',
+  styleUrls: ['./footer.component.scss']
+})
+export class FooterComponent implements OnInit {
+
+  /** Mifos X version. */
+  version: string = environment.version;
+
+  constructor() { }
+
+  ngOnInit() {
+  }
+
+}