enhancement in Gerbview: page limits can be now displayed on screen. Useful when printing a Gerber layer

* Complete comment translation of PCBNew source.
* Some tooltip capitalization fixes in PCBNew toolbars.

But this problem needs more investigations

* Translate source files D through L in pcbnew.
* Add translate tag for comments that did not translate correctly.

But needs wxWidgets >= 2.8.8

* Completed translation of all kicad source.
* Translated source files A through C in pcbnew.

fixed some problems in gencad export (not all)
fixed a size problem when opening dialog_layers_setup2 (windows specific)

* Make cancel button delete new pin instance.
* Make pin redraw correctly to prevent display corruption.
* Prevent edited pin from being move on next left button click.
* Change pin edit property dialog focus to pin name edit text control.

others minor bugs fix.

others minor bugs fix.

Pcbnew: control of masks clearance: Pad Editor Dialog rewritten to handle local mask clearances and a local Net clearance

drc dialog was not showing the Netclass non-editable field on large font systems.  remember last size and position

* Complete comment translation for all EESchema source files.
* Complete comment translation for all 3D viewer source files.
* Rename class class_hierarchical_PIN_sheet to SCH_SHEET_PIN.
* Rename class DrawSheetStruct to SCH_SHEET.
* Tool tip capitalization fixes.
* Uncrustify and spell check comments and strings in all modified source
  files.