Improve messages in incorrect editor modes for better feedback

The messages in the invalid modes for the current data type in "Edit
Database Cell" are improved for giving hint to the user about the correct
modes.

For this commit and 885f4f7 see issue
#1438

src/EditDialog.cpp

@@ -194,15 +194,17 @@ void EditDialog::loadData(const QByteArray& data)
         case TextEditor:
             // Disable text editing, and use a warning message as the contents
             ui->editorText->setText(QString("<i>" %
-                    tr("Image data can't be viewed with the text editor") %
+                    tr("Image data can't be viewed in this mode.") % "<br/>" %
+                    tr("Try switching to Image or Binary mode.") %
                     "</i>"));
             ui->editorText->setEnabled(false);
             break;
 
         case XmlEditor:
         case JsonEditor:
             // Disable text editing, and use a warning message as the contents
-            sciEdit->setText(tr("Image data can't be viewed with this editor"));
+            sciEdit->setText(tr("Image data can't be viewed in this mode.") % '\n' %
+                             tr("Try switching to Image or Binary mode."));
             sciEdit->setEnabled(false);
 
             break;
@@ -258,15 +260,17 @@ void EditDialog::loadData(const QByteArray& data)
         case TextEditor:
             // Disable text editing, and use a warning message as the contents
             ui->editorText->setText(QString("<i>" %
-                    tr("Binary data can't be viewed with the text editor") %
+                    tr("Binary data can't be viewed in this mode.") % "<br/>" %
+                    tr("Try switching to Binary mode.") %
                     "</i>"));
             ui->editorText->setEnabled(false);
             break;
 
          case JsonEditor:
          case XmlEditor:
             // Disable text editing, and use a warning message as the contents
-             sciEdit->setText(QString(tr("Binary data can't be viewed with this editor")));
+             sciEdit->setText(QString(tr("Binary data can't be viewed in this mode.") % '\n' %
+                                      tr("Try switching to Binary mode.")));
              sciEdit->setEnabled(false);
             break;