[Web] Replace country flags, improve flags for last logins, add info about last password change of a user

data/web/css/flags/4x3/cg.svg

@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="flag-icon-css-cg" viewBox="0 0 640 480">
+  <defs>
+    <clipPath id="cg-a">
+      <path fill-opacity=".7" d="M-79.5 32h640v480h-640z"/>
+    </clipPath>
+  </defs>
+  <g fill-rule="evenodd" stroke-width="1pt" clip-path="url(#cg-a)" transform="translate(79.5 -32)">
+    <path fill="#ff0" d="M-119.5 32h720v480h-720z"/>
+    <path fill="#00ca00" d="M-119.5 32v480l480-480h-480z"/>
+    <path fill="red" d="M120.5 512h480V32l-480 480z"/>
+  </g>
+</svg>