EXT-7961 FIXED Added possibility to show label on the back button in Edit Wearables panel.

Implemented behavior:
 * Normally Back button appears narrow without label
 * When wearable is changed - "Save" label is set and button gets wide. Left Border of Title is moved to the right.
   Note: "Save" label is shown without truncation in all languages, Title can be truncated with dots.
 * When changes are saved/reverted - label is removed, button shrinks, Title left border is moved to the its default place.
 * Added consistent tooltip for title (the same as a title).
 * Added tooltip for button: "Save changes if necessary and return back"

Details:
 * added getter for button's font
 * implemented derived from LLButton class for Back button to enable setting necessary label's padding in xml

Reviewed by Neal Orman at https://codereview.productengine.com/secondlife/r/636/

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branch : product-engine

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