[ADF-1706] Translate ADF i18n strings into all supported languages (#2490)

* ALL LANGUAGES: This includes all ADF UI files localised into 10 languages as indicated in JIRA ADF-1706: Translate ADF i18n strings into all supported languages

* ITALIAN: Small amends to Italian strings as part of previous commit to complete ADF-1706

* Add multilanguages

* Load the languages from the app config file

* Fix it json

* Simplify the adf menu languages

* Removed unused code

* Basic documentation

* Fix unit test

docs/language-menu.component.md

@@ -0,0 +1,81 @@
+# Language Menu component
+
+Displays all the languages that are present in the "app.config.json" or the defaul one (EN).
+
+![Language Menu screenshot](docassets/images/languages-menu.png)
+
+<!-- markdown-toc start - Don't edit this section.  npm run toc to generate it-->
+
+<!-- toc -->
+
+- [Basic usage](#basic-usage)
+- [Details](#details)
+- [Nested menu lanugages](#nested-menu-languages)
+- [Nested menu details](#nested-menu-details)
+<!-- tocstop -->
+
+<!-- markdown-toc end -->
+
+## Basic usage
+
+How to attach an ADF Language Menu as main menu
+
+```html
+<button mat-icon-button [matMenuTriggerFor]="langMenu">
+    <mat-icon>language</mat-icon>
+</button>
+<mat-menu #langMenu="matMenu">
+    <adf-lanugage-menu></adf-lanugage-menu>
+</mat-menu>
+```
+
+## Details
+
+In the previous example we are using the ADF Language Menu as main menu.
+The Language Menu component is able to fetch all the languages from the "app.config.json".
+This is how the configuration looks like in the the "app.config.json"
+
+```json
+"languages": [
+        {
+            "key": "en",
+            "label": "English"
+        },
+        {
+            "key": "fr",
+            "label": "French"
+        },
+        {
+            "key": "it",
+            "label": "Italian"
+        }
+    ]
+```
+In case no setting is provided, the component shows only the English language.
+
+<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
+<!-- seealso start -->
+
+## Nested Menu lanugages
+
+How to attach an ADF Language Menu as nested menu
+
+```html
+<button md-icon-button class="dw-profile-menu" [mdMenuTriggerFor]="profileMenu">
+    <md-icon>more_vert</md-icon>
+</button>
+<md-menu #profileMenu="mdMenu">
+    <button md-menu-item>profile-settings</button>
+    <button md-menu-item [matMenuTriggerFor]="langMenu">Languages</button>
+    <button md-menu-item>sign-out</button>
+</md-menu>
+<md-menu #langMenu="mdMenu">
+    <adf-lanugage-menu></adf-lanugage-menu>
+</md-menu>
+```
+![Nested Language Menu screenshot](docassets/images/languages-menu-nested.png)
+
+## Nested menu details
+
+In the previous example we are using the ADF Language Menu as nested menu.
+<!-- seealso end -->