add plugin install button

InvenTree/templates/js/translated/plugin.js

@@ -0,0 +1,26 @@
+{% load i18n %}
+{% load inventree_extras %}
+
+/* globals
+    constructForm,
+*/
+
+/* exported
+    installPlugin,
+*/
+
+function installPlugin() {
+    constructForm(`/api/plugin/install/`, {
+        method: 'POST',
+        title: '{% trans "Install Plugin" %}',
+        fields: {
+            url: {},
+            packagename: {},
+            confirm: {},
+        },
+        onSuccess: function(data) {
+            msg = '{% trans "The Plugin was installed" %}';
+            showMessage(msg, {style: 'success', details: data.result, timeout: 30000});
+        }
+    });
+}