Implemented the "Contrast" header with the sept-12 font icons.
Added a forgotten messages file.
Implemented the "Increase size" header with the sept-12 font icons.
The header image tick and star have fixed dimensions.
Using the three different cursor icons for cursor-size preview from
sept-12 font icons.
Had to apply this change for overlaid ticks on headers to render
correctly in Chrome.
Corrected the overlaid magnifier font icons in contrast.