spelling fixes (#18688)

* Fixes spelling of "Allow to" to "Allow one to"

and those variants:
Allows to -> Allows one to
allow to -> allow one to
allows to -> allows one to

* Fix "Let's -> Lets"

(and lower case variant.)

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update src/3rdParty/salomesmesh/inc/MED_Wrapper.hxx

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

* Update src/Base/PyObjectBase.cpp
Update src/App/ExtensionContainer.h
Update src/App/PropertyContainer.h

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

* Use gerund in user-facing texts.

* Use gerund for two more user-facing strings.

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

* Update src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

* Update src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

* Update src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

---------

Co-authored-by: Tobias Frost <tobi@debian.org>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

src/Gui/ViewProviderExtensionPython.h

@@ -30,7 +30,7 @@
 namespace Gui {
 
 /**
- * Generic Python extension class which allows to behave every extension
+ * Generic Python extension class which allows one to behave every extension
  * derived class as Python extension -- simply by subclassing.
  */
 template <class ExtensionT>