Add createDropdown and createLanguageSelector in cryptpad-common

customize.dist/terms.html

@@ -20,13 +20,7 @@
 
 
 
-    <span id="language-selector" class="dropdown-bar">
-        <button>
-            <span class="buttonTitle" data-localozation="language"></span>
-            <span class="fa fa-caret-down"></span>
-        </button>
-        <div class="left cryptpad-dropdown dropdown-bar-content"></div>
-    </span>
+    <span id="language-selector" class="dropdown-bar"></span>
 
     <div id="main">
       <center>