Remove national flags from the language select.(Solution 2) (#825)

* Remove national flags from the language select.

* Removed flag-icon-css.

* Removed the line break for old language select.

assets/img/flags/pw.svg

@@ -1,11 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" height="480" width="640">
-  <defs>
-    <clipPath id="a">
-      <path fill-opacity=".67" d="M-70.28 0h640v480h-640z"/>
-    </clipPath>
-  </defs>
-  <g fill-rule="evenodd" clip-path="url(#a)" transform="translate(70.28)" stroke-width="1pt">
-    <path fill="#4aadd6" d="M-173.44 0h846.32v480h-846.32z"/>
-    <path d="M335.633 232.117a135.876 130.111 0 1 1-271.752 0 135.876 130.111 0 1 1 271.752 0z" fill="#ffde00"/>
-  </g>
-</svg>