[WIP]: Add FIleMosaic Demo Localization, upload, darkmode and file icons....

[WIP]: Add FIleMosaic Demo Localization, upload, darkmode and file icons. Missing to properly set the right menu. Also missing to decide whether to keep the extensive list in FIle mosaic demo page and replicate in File card or to create a new page for the list of icons

src/pages/demo/FileMosaicDemoPage.jsx

@@ -294,7 +294,7 @@ const FileMosaicDemoPage = (props) => {
           <SubTitle content="File Icons (extensive list)" />
           <DescParagraph>
             The <CodeHighlight>FileMosaic</CodeHighlight> component supports
-            aseveral file types to properly set a file icon. The complete list of file icons is the following:
+            several file types to properly set a file icon. The complete list of file icons is the following:
           </DescParagraph>
 
           <DemoContainerFileMosaic