Merge https://github.com/prati0100/git-gui

Merge https://github.com/prati0100/git-gui

* 'master' of https://github.com/prati0100/git-gui:
  git-gui: create a new namespace for chord script evaluation
  git-gui: reduce Tcl version requirement from 8.6 to 8.5
  git-gui--askpass: coerce answers to UTF-8 on Windows
  git-gui: fix error popup when doing blame -> "Show History Context"
  git-gui: add missing close bracket
  git-gui: update German translation
  git-gui: extend translation glossary template with more terms
  git-gui: update pot template and German translation to current source code