Fix some typos on several files

- Missing spaces
- Missing commas
- 3D, G-code, Git, SPOOLES, Python capitalization

src/Mod/Part/Gui/DlgExtrusion.ui

@@ -65,7 +65,7 @@
       <item row="5" column="2">
        <widget class="QPushButton" name="btnSelectEdge">
         <property name="toolTip">
-         <string>Click to start selecting an edge in 3d view.</string>
+         <string>Click to start selecting an edge in 3D view.</string>
         </property>
         <property name="text">
          <string>Select</string>

src/Mod/Part/Gui/TaskSweep.cpp

@@ -411,7 +411,7 @@ void SweepWidget::onButtonPathToggled(bool on)
         d->buttonText = d->ui.buttonPath->text();
         d->ui.buttonPath->setText(tr("Done"));
         d->ui.buttonPath->setEnabled(true);
-        d->ui.labelPath->setText(tr("Select one or more connected edges in the 3d view and press 'Done'"));
+        d->ui.labelPath->setText(tr("Select one or more connected edges in the 3D view and press 'Done'"));
         d->ui.labelPath->setEnabled(true);
 
         Gui::Selection().clearSelection();