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/Afrikaans.lang

@@ -0,0 +1,30 @@
+/**
+ * Afrikaans translation
+ *  @name Afrikaans
+ *  @anchor Afrikaans
+ *  @author <a href="http://www.ajoft.com">Ajoft Software</a>
+ */
+
+{
+	"sEmptyTable":     "Geen data beskikbaar in tabel",
+	"sInfo":           "uitstalling _START_ to _END_ of _TOTAL_ inskrywings",
+	"sInfoEmpty":      "uitstalling 0 to 0 of 0 inskrywings",
+	"sInfoFiltered":   "(gefiltreer uit _MAX_ totaal inskrywings)",
+	"sInfoPostFix":    "",
+	"sInfoThousands":  ",",
+	"sLengthMenu":     "uitstal _MENU_ inskrywings",
+	"sLoadingRecords": "laai...",
+	"sProcessing":     "verwerking...",
+	"sSearch":         "soektog:",
+	"sZeroRecords":    "Geen treffers gevind",
+	"oPaginate": {
+		"sFirst":    "eerste",
+		"sLast":     "laaste",
+		"sNext":     "volgende",
+		"sPrevious": "vorige"
+	},
+	"oAria": {
+		"sSortAscending":  ": aktiveer kolom stygende te sorteer",
+		"sSortDescending": ": aktiveer kolom orde te sorteer"
+	}
+}