Fix several issues with mobile keyboard

[JohnHKoh]

On mobile, after refreshing the page or re-opening the keyboard, the first key entered would show a "$" no matter what key was pressed. This was due to the value being set to {char}$ instead of the expected ${char}, I guess due to the behavior where clicking on a textarea makes your cursor insert at the start. This changes onfocus to set the cursor to the end of the textarea value. See stackoverflow answer here: https://stackoverflow.com/a/10576409/4157513 (the "quirk" they mention doesn't seem to apply anymore to my version of Chrome).

Also updated autoComplete and autoCapitalize attributes for better keyboard behavior on mobile.

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