Translations:Release notes 0.19/176/en


 * Added support for existing Python virtual environments; pull request #2021.
 * Pre-select name filter in the import/export dialog; forum discussion, commit e239994,
 * Fixed missing application ID and icon on GNOME/Wayland; pull request #2466.
 * Added support for Hertz as a physical unit, and added the Frequency property; forum discussion, commit 3500451a0, commit d7ca604c9.
 * Added Std TextDocument tool to insert an object to store arbitrary text in the document; commit 13db5b0560, commit 53b01f08f9.
 * Added support for further units, Gauss, Weber, Oersted; forum discussion, pull request #2863.