update english after PR review in the project validator

python/core/auto_generated/qgsprojectservervalidator.sip.in

@@ -13,7 +13,7 @@
 class QgsProjectServerValidator
 {
 %Docstring
-Project server validator.
+Validates the server specific parts of the configuration of a QGIS project.
 
 .. versionadded:: 3.14
 %End
@@ -59,7 +59,7 @@ Constructor for ValidationResult.
 
     static bool validate( QgsProject *project, QList< QgsProjectServerValidator::ValidationResult > &results /Out/ );
 %Docstring
-Validates a project to avoid some problems on QGIS Server, and returns ``True`` if it's considered valid.
+Validates a project to detect problems on QGIS Server, and returns ``True`` if it's considered valid.
 If validation fails, the ``results`` list will be filled with a list of
 items describing why the validation failed and what needs to be rectified
 

src/app/qgsprojectproperties.cpp

@@ -1922,7 +1922,7 @@ void QgsProjectProperties::pbnLaunchOWSChecker_clicked()
   }
   else
   {
-    errors += QString( tr( "Ok, it seems valid." ) );
+    errors += tr( "Project is valid." );
   }
 
   QString myStyle = QgsApplication::reportStyleSheet();

src/core/qgsprojectservervalidator.cpp

@@ -27,11 +27,11 @@ QString QgsProjectServerValidator::displayValidationError( QgsProjectServerValid
   switch ( error )
   {
     case QgsProjectServerValidator::Encoding:
-      return QObject::tr( "Encoding is not set properly. A non 'System' encoding is required" );
+      return QObject::tr( "Encoding is not correctly set. A non 'System' encoding is required" );
     case QgsProjectServerValidator::ShortNames:
       return QObject::tr( "Layer short name is not valid. It must start with an unaccented alphabetical letter, followed by any alphanumeric letters, dot, dash or underscore" );
     case QgsProjectServerValidator::DuplicatedNames:
-      return QObject::tr( "One or more layers or groups have the same name or short name. Both the 'name' and 'short name' for layers and groups needs to be unique" );
+      return QObject::tr( "One or more layers or groups have the same name or short name. Both the 'name' and 'short name' for layers and groups must be unique" );
   }
   return QString();
 }
@@ -67,7 +67,7 @@ void QgsProjectServerValidator::browseLayerTree( QgsLayerTreeGroup *treeGroup, Q
         if ( layer->type() == QgsMapLayerType::VectorLayer )
         {
           QgsVectorLayer *vl = static_cast<QgsVectorLayer *>( layer );
-          if ( vl->dataProvider()->encoding() == QLatin1String( "System" ) )
+          if ( vl->dataProvider() && vl->dataProvider()->encoding() == QLatin1String( "System" ) )
             encodingMessages << layer->name();
         }
       }

src/core/qgsprojectservervalidator.h

@@ -19,14 +19,15 @@
 #define QGSPROJECTSERVERVALIDATOR_H
 
 #include "qgis_core.h"
+#include "qgis_sip.h"
 #include "qgslayertreegroup.h"
 #include "qgslayertree.h"
 
 
 /**
  * \ingroup core
  * \class QgsProjectServerValidator
- * \brief Project server validator.
+ * \brief Validates the server specific parts of the configuration of a QGIS project.
  * \since QGIS 3.14
  */
 class CORE_EXPORT QgsProjectServerValidator
@@ -76,13 +77,13 @@ class CORE_EXPORT QgsProjectServerValidator
       QgsProjectServerValidator::ValidationError error;
 
       /**
-       * Identifier related to the error.
+       * Identifier related to the error. It can be a layer/group name.
        */
       QVariant identifier;
     };
 
     /**
-     * Validates a project to avoid some problems on QGIS Server, and returns TRUE if it's considered valid.
+     * Validates a project to detect problems on QGIS Server, and returns TRUE if it's considered valid.
      * If validation fails, the \a results list will be filled with a list of
      * items describing why the validation failed and what needs to be rectified
      * \param project input project to check