Fix: update gettext scan script to avoid obsolete translations (sphinx only)

(cherry picked from commit 976cb88)

Author: PierreRaybaut

scripts/gettext_scan.bat

@@ -10,5 +10,5 @@ call %FUNC% GetVersion CDL_VERSION
 set BUILDDIR=%SCRIPTPATH%\..\build\gettext
 cd %SCRIPTPATH%\..\doc
 sphinx-build . %BUILDDIR% -b gettext
-sphinx-intl update -p %BUILDDIR% -l fr
+sphinx-intl update -p %BUILDDIR% -l fr --no-obsolete -w 0
 call %~dp0gettext rescan