User language control via userlang query param

This is a draft commit enabling the testing of the support for
kiwix-serve internationalization.

static/i18n/hy.json

@@ -0,0 +1,8 @@
+{
+	"@metadata": {
+		"authors": [
+		]
+	},
+	"name":"Հայերեն",
+	"suggest-full-text-search": "որոնել '{{{SEARCH_TERMS}}}'..."
+}

static/i18n_resources_list.txt

@@ -1 +1,2 @@
 i18n/en.json
+i18n/hy.json

static/skin/taskbar.js

@@ -12,9 +12,10 @@ jq(document).ready(() => {
                ? (new URLSearchParams(window.location.search)).get('content') 
                : window.location.pathname.split(`${root}/`)[1].split('/')[0];
     
+        const userlang = (new URLSearchParams(window.location.search)).get('userlang') || "en";
         $( "#kiwixsearchbox" ).autocomplete({
     
-            source: `${root}/suggest?content=${bookName}`,
+            source: `${root}/suggest?content=${bookName}&userlang=${userlang}`,
             dataType: "json",
             cache: false,