Bug 1566358 - Update releases page to include 64-bit Windows and Linux platforms - switch to using x64/x86 instead of 64-bit/32-bit in XML files and fix div overflows, etc r=me

lib/downloads_fieldset.en.xml

@@ -1,10 +1,10 @@
 <dropdowns>
   <dropdown id="download_platform" label="Which operating system are you using?" aria="download_info">
-    <option value="win64" label="Windows 64-bit" />
-    <option value="win" label="Windows 32-bit" />
-    <option value="osx" label="macOS" />
-    <option value="linux64" label="Linux 64-bit" />
-    <option value="linux" label="Linux 32-bit" />
+    <option value="win64" label="Windows x64" />
+    <option value="win" label="Windows x86" />
+    <option value="osx" label="macOS x64" />
+    <option value="linux64" label="Linux x64" />
+    <option value="linux" label="Linux x86" />
   </dropdown>
   <dropdown id="download_language" label="Would you like to select a different language?" aria="download_info">
     <option value="zh-CN" label="Chinese (Simplified) — 中文 (简体)" />

lib/downloads_table.en.xml

@@ -1,11 +1,11 @@
 <downloads summary="SeaMonkey builds available for download.">
   <header name="Language" colspan="2" class="top-left"/>
   <header name="Version" />
-  <header name="Windows" second="64-bit" spanclass="download-win" />
-  <header name="Windows" second="32-bit" spanclass="download-win" />
-  <header name="macOS" spanclass="download-mac" />
-  <header name="Linux" second="64-bit" class="top-right" spanclass="download-linux" />
-  <header name="Linux" second="32-bit" class="top-right" spanclass="download-linux" />
+  <header name="Windows" second="x64" spanclass="download-win" />
+  <header name="Windows" second="x86" spanclass="download-win" />
+  <header name="macOS" second="x64" spanclass="download-mac" />
+  <header name="Linux" second="x64" class="top-right" spanclass="download-linux" />
+  <header name="Linux" second="x86" class="top-right" spanclass="download-linux" />
   <language id="zh-CN">
     <cell name="Chinese (Simplified)" />
     <cell lang="zh-CN" native="中文 (简体)" />

src/css/artemia/content.css

@@ -126,7 +126,13 @@ h1:target, h2:target, h3:target, h4:target, h5:target, h6:target {
   margin-bottom: 1em;
   border-radius: .5em;
   box-shadow: 2px 2px 2px #c2c6c6;
+  overflow: auto;
 } * html .key-point { height: 1px; }
+.key-point:after {
+  clear: both;
+  display: block;
+  content: "";
+}
 
 .key-point h2, .key-point h3, .key-point h4, .key-point h5 {
   border: none;