UI fixes

'light' theme (console & apps):
- Rework to reduce contrast (ticket #1996)
- Add custom radio/checkbox icons for Chrome/Blink

Console:
- Fix reseed failure notice overlap when "check connection" message shown
- Enhance presentation of console "error 500" messages
- Cosmetic tweaks to welcome page presentation, arabic welcome page tidyup
- Migrate .smallhead th class to tr to simplify markup
- Sidebar:
  - Remove "Congestion" from default sidebar (still present in default
    advanced sidebar)
  - Fix label wrapping issue with translations
  - Migrate sidepanel news section to tables to permit better control over
    wrapping and placement (ticket #1996)
  - Move news item dates to tooltips to lessen chance of headlines wrapping
    and cleanup presentation
  - Increase maximum length of local tunnel links in the sidebar (and handle
    overflow with CSS) to minimize chance of default tunnels display
    truncating in translations
  - Add the power off icon to sidebar restart button on hover to clarify
    button function (ticket #1996)
- /configadvanced: Move floodfill status to row above to remove unnecessary
  whitespace and cleanup UI
- /debug: Add debug icon to h2 headers to aid navigation
- /graphs: Improve presentation of graph images by removing rendered border
  and setting background color to better integrate with themes
- /home: Widen div.app to lessen chance of truncation (classic/midnight)
- /jars:
  - Minimize table overflow with conditional scaling of content
  - One-click select for revision, sha256 & unsigned mods
- /logs:
  - Reduce line/entry spacing for router and critical logs (#ticket 1996)
  - Multi-column view for changelog at >=1400px to address horizontal
    whitespace issue
- /netdb:
  - Multi-column display of Leases in LeaseSet tables
  - Better alignment of Lease elements, iconify gateway
  - Placeholder flag for unknown/unresolved peers for [flag+dest] combos to
    improve presentation / fix deadspace issue
- Chinese:
  - Fix alignment of table contents in /tunnels (classic)
  - Fix sidebar content display width (midnight)
  - Cosmetic fixes (all themes)

I2PTunnel:
- Ensure message log font scales proportionately
- Fix overflow issue with dropdowns in Chrome/blink (dark/midnight)

SusiDNS
- Reduce width of filter buttons to lessen chance of wrapping (ticket #1996)
- Add non-selectable items to improve copy/paste of hosts in address books
- Make dest addresses in host list only display scrollbar on focus to reduce
  screen clutter
- Hide broken imagegen images

SusiMail: Enhance presentation of 'postman' links on login panel

apps/routerconsole/java/src/net/i2p/router/web/SummaryRenderer.java

@@ -35,6 +35,9 @@ class SummaryRenderer {
     private final Log _log;
     private final SummaryListener _listener;
     private final I2PAppContext _context;
+    private static final Color BACK_COLOR = new Color(246, 246, 255);
+    private static final Color SHADEA_COLOR = new Color(246, 246, 255);
+    private static final Color SHADEB_COLOR = new Color(246, 246, 255);
     private static final Color GRID_COLOR = new Color(100, 100, 100, 75);
     private static final Color MGRID_COLOR = new Color(255, 91, 91, 110);
     private static final Color AREA_COLOR = new Color(100, 160, 200, 200);
@@ -131,8 +134,11 @@ class SummaryRenderer {
             RrdGraphDef def = new RrdGraphDef();
 
             // Override defaults
-            def.setColor(RrdGraphDef.COLOR_GRID,  GRID_COLOR);
-            def.setColor(RrdGraphDef.COLOR_MGRID, MGRID_COLOR);
+            def.setColor(RrdGraphDef.COLOR_BACK,   BACK_COLOR);
+            def.setColor(RrdGraphDef.COLOR_SHADEA, SHADEA_COLOR);
+            def.setColor(RrdGraphDef.COLOR_SHADEB, SHADEB_COLOR);
+            def.setColor(RrdGraphDef.COLOR_GRID,   GRID_COLOR);
+            def.setColor(RrdGraphDef.COLOR_MGRID,  MGRID_COLOR);
             def.setFont(RrdGraphDef.FONTTAG_DEFAULT, new Font(DEFAULT_FONT_NAME, Font.PLAIN, 10));
             def.setFont(RrdGraphDef.FONTTAG_TITLE,   new Font(DEFAULT_FONT_NAME, Font.PLAIN, 10));
             def.setFont(RrdGraphDef.FONTTAG_AXIS,    new Font("Droid Sans Mono", Font.PLAIN, 10));