Bugs correction and translation

Release 0.6.40 of CurvesWB allows to some bugs to popup: corrected.
For issue "Add support for translation of the strings", for the moment I removed the French translation. All is in English now. Code for translation are already incorporated. Waiting for translation files.

What's Changed

• Make license match SPDX ID by @chennes in #34
• Update LICENSE by @Simturb in #35
• Update icons to be consistent with FreeCAD by @maxwxyz in #37

New Contributors

• @maxwxyz made their first contribution in #37

Full Changelog: 1.0.8...1.1