Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/public/elite/bower_components/datatables-plugins/i18n/German.lang

@@ -0,0 +1,30 @@
+/**
+ * German translation
+ *  @name German
+ *  @anchor German
+ *  @author Joerg Holz
+ */
+
+{
+	"sEmptyTable":   	"Keine Daten in der Tabelle vorhanden",
+	"sInfo":         	"_START_ bis _END_ von _TOTAL_ Einträgen",
+	"sInfoEmpty":    	"0 bis 0 von 0 Einträgen",
+	"sInfoFiltered": 	"(gefiltert von _MAX_ Einträgen)",
+	"sInfoPostFix":  	"",
+	"sInfoThousands":  	".",
+	"sLengthMenu":   	"_MENU_ Einträge anzeigen",
+	"sLoadingRecords": 	"Wird geladen...",
+	"sProcessing":   	"Bitte warten...",
+	"sSearch":       	"Suchen",
+	"sZeroRecords":  	"Keine Einträge vorhanden.",
+	"oPaginate": {
+		"sFirst":    	"Erste",
+		"sPrevious": 	"Zurück",
+		"sNext":     	"Nächste",
+		"sLast":     	"Letzte"
+	},
+	"oAria": {
+		"sSortAscending":  ": aktivieren, um Spalte aufsteigend zu sortieren",
+		"sSortDescending": ": aktivieren, um Spalte absteigend zu sortieren"
+	}
+}