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/4x3/se.svg

@@ -1,16 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" height="480" width="640">
-  <defs>
-    <clipPath id="a">
-      <path fill-opacity=".67" d="M-53.421 0h682.67v512h-682.67z"/>
-    </clipPath>
-  </defs>
-  <g clip-path="url(#a)" transform="translate(50.082) scale(.9375)">
-    <g fill-rule="evenodd" stroke-width="1pt">
-      <path fill="#006aa7" d="M-121.103.302h256V205.1h-256zM-121.103 307.178h256v204.8h-256z"/>
-      <path fill="#fecc00" d="M-121.103 204.984h256v102.4h-256z"/>
-      <path fill="#fecc00" d="M133.843.01h102.4v511.997h-102.4z"/>
-      <path fill="#fecc00" d="M232.995 205.013h460.798v102.4H232.995z"/>
-      <path fill="#006aa7" d="M236.155 307.208h460.797v204.799H236.155zM236.155.302h460.797V205.1H236.155z"/>
-    </g>
-  </g>
-</svg>