I18n: Update translation es (100%).

172 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Fix frameSetShape function
Added titleless maximization feature

Conflicts:
	settings-dialogs/xfwm4-settings.c
	settings-dialogs/xfwm4-tweaks-dialog.glade
Add Hide title of windows when maximized option
Tweak frame.c functions to activate titleless option (when window is fully maximized only).
force redraw titleless maximized window when resizing to show title
sparse draw button code in a new function frameDrawButtons
change top border creation for hiding capabilities (add frameTopBorder and frameTitle functions)
enable hiding top border when maximized
split title-*.xpm into title and top border part if top-3-active.xpm don't exist
add optional top_border_height parameter
add optional top_border_maximize parameter
disable shading for maximized windows without title
remove unused-variable in main.c to fix gcc warning
Add title_on_maximize_key shortcut
Fix #2 : title visiblity when the user unmaximize windows
Fix toogleMaximize fn when window is solely maximized verticaly or horizontaly
Improve auto-maximize fn to maximize windows which size is equal to the available size
Update translation fr (100%)
Prepare release