Clean comments (#6420)

* Add script to trigger test on utils

* Add new function to remove the comments from the settings file.
It reduces the size of the payload when we save on the admin page `.../admin/settings`

* Add     font-family: monospace; to the settings

src/tests/backend/specs/admin_utils.ts

@@ -0,0 +1,38 @@
+'use strict';
+
+
+import {strict as assert} from "assert";
+import {cleanComments, minify} from "../../../../admin/src/utils/utils.js";
+
+const fs = require('fs');
+const fsp = fs.promises;
+let template:string;
+
+describe(__filename, function () {
+  before(async function () {
+    template = await fsp.readFile('../settings.json.template', 'utf8')
+  });
+  describe('adminUtils', function () {
+    it('cleanComments function empty', async function () {
+      assert.equal(cleanComments(""), "");
+    });
+    it('cleanComments function HelloWorld no comment', async function () {
+      assert.equal(cleanComments("HelloWorld"), "HelloWorld");
+    });
+    it('cleanComments function HelloWorld with comment', async function () {
+      assert.equal(cleanComments("Hello/*abc*/World/*def*/"), "HelloWorld");
+    });
+    it('cleanComments function HelloWorld with comment and multiline', async function () {
+      assert.equal(cleanComments("Hello \n/*abc\nxyz*/World/*def*/"), "Hello\nWorld");
+    });
+    it('cleanComments function HelloWorld with multiple line breaks', async function () {
+      assert.equal(cleanComments("  \nHello \n  \n  \nWorld/*def*/"), "Hello\nWorld");
+    });
+    it('cleanComments function same after minified', async function () {
+      assert.equal(minify(template), minify(cleanComments(template)!));
+    });
+    it('minified results are smaller', async function () {
+      assert.equal(minify(template).length < template.length, true);
+    });
+  });
+});