[BUGFIX] #67 Print - Scales not well manage

The code has to be refactoring to be more robust.
[Feature] #68 Add GetContext in lizmap service

QGIS-Server has an extended REQUEST : GetContext.
This request returns an OWSContext file.
[FEATURE] #59 Add the capability to have combobox without toggle

In some case it would be useful to have locateByLayers without toggle.
The administrator has to define the minimum letters to enter in the combobox,
 before the list appear.
[BUGFIX] #69 Error in edition when INSERT or UPDATE whith Checkbox

This bug is linked to #66 Edition - debug edit types change after QGIS 2.4

This bug is due to the changes in edit type description in the QGIS project
 and specifically for the CheckBox type.
IT translation update
fixes translation string
changes text color for alert to be more readable
adds a couple of strings to translation process