Final language file update for 5.4

All files are 100% complete, including the final few adjustments to
batch process text.
Add About link to Robert's PaintRR
Comment out unneeded code
Visual improvements to software update window
Speed improvements to HSL code
Add missing undo/redo text for Autocrop
Add default JPEG quality for GDI+ saving

Previously it was defaulting to 0.  Oops!
Small adjustments to update checking code
New icons for the software update window command buttons
Final adjustments to batch wizard