Deduplicated styling of UI language selector

There was a slight difference (between index.css and taskbar.css) in the
margin values of the UI language selector button, however the values
taken from taskbar.css don't seem to have any visible impact on the
welcome/library page (controlled by index.css).

static/skin/index.css

@@ -140,29 +140,6 @@
     font-weight: bolder;
 }
 
-#uiLanguageSelector {
-  display: none;
-}
-
-#uiLanguageSelector .modal {
-  height: 140px;
-}
-
-#uiLanguageSelector .modal-heading {
-  height: 40%;
-}
-
-#uiLanguageSelector .modal-content #ui_language {
-  font-size: 1.6rem;
-  width: 100%;
-}
-
-#uiLanguageSelectorButton {
-  margin: 0 12px 0 0;
-  float: right;
-  cursor: pointer;
-}
-
 .book__list {
     position: relative;
     margin: 0 auto;
@@ -395,7 +372,7 @@
     width: auto;
 }
 
-.feedLogo, #uiLanguageSelectorButton {
+.feedLogo {
     height: 30px;
     float: right;
 }

static/skin/kiwix.css

@@ -72,6 +72,30 @@ body {
     padding: 20px;
 }
 
+#uiLanguageSelector {
+  display: none;
+}
+
+#uiLanguageSelector .modal {
+  height: 140px;
+}
+
+#uiLanguageSelector .modal-heading {
+  height: 40%;
+}
+
+#uiLanguageSelector .modal-content #ui_language {
+  font-size: 1.6rem;
+  width: 100%;
+}
+
+#uiLanguageSelectorButton {
+  margin: 0px 12px 6px 12px;
+  float: right;
+  cursor: pointer;
+  height: 30px;
+}
+
 @font-face {
   font-family: "poppins";
   src: url("../skin/fonts/Poppins.ttf?KIWIXCACHEID") format("truetype");

static/skin/taskbar.css

@@ -131,30 +131,6 @@ a.suggest, a.suggest:visited, a.suggest:hover, a.suggest:active {
     column-count: 1 !important;
 }
 
-#uiLanguageSelector {
-  display: none;
-}
-
-#uiLanguageSelector .modal {
-  height: 140px;
-}
-
-#uiLanguageSelector .modal-heading {
-  height: 40%;
-}
-
-#uiLanguageSelector .modal-content #ui_language {
-  font-size: 1.6rem;
-  width: 100%;
-}
-
-#uiLanguageSelectorButton {
-  margin: 0px 12px 6px 12px;
-  float: right;
-  cursor: pointer;
-  height: 30px;
-}
-
 @media(min-width:420px) {
     .kiwix_button_cont {
         display: inline-block !important;

test/library_server.cpp

@@ -1028,12 +1028,12 @@ TEST_F(LibraryServerTest, no_name_mapper_catalog_v2_individual_entry_access)
   "    <title>Welcome to Kiwix Server</title>\n" \
   "    <link\n" \
   "      type=\"text/css\"\n" \
-  "      href=\"/ROOT%23%3F/skin/kiwix.css?cacheid=bdae4d22\"\n" \
+  "      href=\"/ROOT%23%3F/skin/kiwix.css?cacheid=9b1b089f\"\n" \
   "      rel=\"Stylesheet\"\n" \
   "    />\n" \
   "    <link\n" \
   "      type=\"text/css\"\n" \
-  "      href=\"/ROOT%23%3F/skin/index.css?cacheid=081e1606\"\n" \
+  "      href=\"/ROOT%23%3F/skin/index.css?cacheid=4196ad7d\"\n" \
   "      rel=\"Stylesheet\"\n" \
   "    />\n" \
   "    <link rel=\"apple-touch-icon\" sizes=\"180x180\" href=\"/ROOT%23%3F/skin/favicon/apple-touch-icon.png?cacheid=f86f8df3\">\n" \

test/server.cpp

@@ -61,17 +61,19 @@ const ResourceCollection resources200Compressible{
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/i18n.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/i18n.js?cacheid=6a8c6fb2" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/index.css" },
-  { STATIC_CONTENT,  "/ROOT%23%3F/skin/index.css?cacheid=081e1606" },
+  { STATIC_CONTENT,  "/ROOT%23%3F/skin/index.css?cacheid=4196ad7d" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/index.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/index.js?cacheid=ce19da2a" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/iso6391To3.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/iso6391To3.js?cacheid=ecde2bb3" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/isotope.pkgd.min.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/isotope.pkgd.min.js?cacheid=2e48d392" },
+  { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/kiwix.css" },
+  { STATIC_CONTENT,  "/ROOT%23%3F/skin/kiwix.css?cacheid=9b1b089f" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/mustache.min.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/mustache.min.js?cacheid=bd23c4fb" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/taskbar.css" },
-  { STATIC_CONTENT,  "/ROOT%23%3F/skin/taskbar.css?cacheid=04cb5531" },
+  { STATIC_CONTENT,  "/ROOT%23%3F/skin/taskbar.css?cacheid=8c05f7fc" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/viewer.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/viewer.js?cacheid=201653b8" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/fonts/Poppins.ttf" },
@@ -140,8 +142,6 @@ const ResourceCollection resources200Uncompressible{
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/favicon/site.webmanifest?cacheid=bc396efb" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/hash.png" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/hash.png?cacheid=f836e872" },
-  { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/kiwix.css" },
-  { STATIC_CONTENT,  "/ROOT%23%3F/skin/kiwix.css?cacheid=bdae4d22" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/magnet.png" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/magnet.png?cacheid=73b6bddf" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/search-icon.svg" },
@@ -276,8 +276,8 @@ TEST_F(ServerTest, CacheIdsOfStaticResources)
   const std::vector<UrlAndExpectedResult> testData{
     {
       /* url */ "/ROOT%23%3F/",
-R"EXPECTEDRESULT(      href="/ROOT%23%3F/skin/kiwix.css?cacheid=bdae4d22"
+R"EXPECTEDRESULT(      href="/ROOT%23%3F/skin/kiwix.css?cacheid=9b1b089f"
-      href="/ROOT%23%3F/skin/index.css?cacheid=081e1606"
+      href="/ROOT%23%3F/skin/index.css?cacheid=4196ad7d"
     <link rel="apple-touch-icon" sizes="180x180" href="/ROOT%23%3F/skin/favicon/apple-touch-icon.png?cacheid=f86f8df3">
     <link rel="icon" type="image/png" sizes="32x32" href="/ROOT%23%3F/skin/favicon/favicon-32x32.png?cacheid=79ded625">
     <link rel="icon" type="image/png" sizes="16x16" href="/ROOT%23%3F/skin/favicon/favicon-16x16.png?cacheid=a986fedc">
@@ -315,8 +315,8 @@ R"EXPECTEDRESULT(                                <img src="${root}/skin/download
     },
     {
       /* url */ "/ROOT%23%3F/viewer",
-R"EXPECTEDRESULT(    <link type="text/css" href="./skin/kiwix.css?cacheid=bdae4d22" rel="Stylesheet" />
+R"EXPECTEDRESULT(    <link type="text/css" href="./skin/kiwix.css?cacheid=9b1b089f" rel="Stylesheet" />
-    <link type="text/css" href="./skin/taskbar.css?cacheid=04cb5531" rel="Stylesheet" />
+    <link type="text/css" href="./skin/taskbar.css?cacheid=8c05f7fc" rel="Stylesheet" />
     <link type="text/css" href="./skin/css/autoComplete.css?cacheid=08951e06" rel="Stylesheet" />
     <script type="module" src="./skin/i18n.js?cacheid=6a8c6fb2" defer></script>
     <script type="text/javascript" src="./skin/languages.js?cacheid=96f2cf73" defer></script>