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/shared.module.ts

@@ -1,34 +1,44 @@
  /** Angular Imports */
 import { NgModule } from '@angular/core';
 import { CommonModule } from '@angular/common';
+import { ReactiveFormsModule } from '@angular/forms';
 
 /** Custom Components */
-import { FileUploadComponent } from './file-upload/file-upload.component';
 import { DeleteDialogComponent } from './delete-dialog/delete-dialog.component';
+import { FileUploadComponent } from './file-upload/file-upload.component';
+import { FooterComponent } from './footer/footer.component';
+import { LanguageSelectorComponent } from './language-selector/language-selector.component';
 
 /** Custom Modules */
-import { MaterialModule } from './material.module';
 import { IconsModule } from './icons.module';
+import { MaterialModule } from './material.module';
 
 /**
  * Shared Module
+ *
  * Modules and components that are shared throughout the application should be here.
  */
 @NgModule({
   imports: [
     CommonModule,
     IconsModule,
-    MaterialModule
+    MaterialModule,
+    ReactiveFormsModule
   ],
   declarations: [
     DeleteDialogComponent,
-    FileUploadComponent
+    FileUploadComponent,
+    FooterComponent,
+    LanguageSelectorComponent
   ],
   exports: [
     FileUploadComponent,
+    FooterComponent,
+    LanguageSelectorComponent,
     CommonModule,
     IconsModule,
-    MaterialModule
+    MaterialModule,
+    ReactiveFormsModule
   ],
   entryComponents: [
     DeleteDialogComponent