Revert to wxpython 4.0.6 once again (see issue 2136)

.appveyor.yml

@@ -3,7 +3,7 @@ clone_depth: 400
 
 environment:
   matrix:
-    - PYTHON: "C:\\Python38-x64"
+    - PYTHON: "C:\\Python37-x64"
 # Should be enabled only for build process debugging
 # init:
 #   - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
@@ -40,6 +40,8 @@ install:
   # pip will build them from source using the MSVC compiler matching the
   # target Python version and architecture
   - ps: echo("Install pip requirements:")
+  # This one is needed to build wxpython 4.0.6 on windows
+  - cmd: "python -m pip install pathlib2"
   - cmd: "python -m pip install -r requirements.txt"
   - cmd: "python -m pip install PyInstaller==3.6"
 

pyfa.py

@@ -140,7 +140,6 @@ def _process_args(self, largs, rargs, values):
             options.title = "pyfa %s - Python Fitting Assistant" % (config.getVersion())
 
         pyfa = wx.App(False)
-        pyfa.ResetLocale()
         mf = MainFrame(options.title)
         ErrorHandler.SetParent(mf)
 

requirements.txt

@@ -1,4 +1,4 @@
-wxPython == 4.0.7.post2
+wxPython == 4.0.6
 logbook >= 1.0.0
 matplotlib >= 3.1.2
 python-dateutil