Log Message:
Update to 2.26.1. Set LICENSE to gnu-gpl-v2.

Version 2.26.1
--------------

  * UI improvements (Gabor Kelemen)
  * Code improvements / fixes (Josselin Mouette, Felix Riemann)

Bug fixes:

  #575772, Move to Trash button has no accelerator (Gabor Kelemen)
  #576558, Crashes when trying to save write protected file (Josselin Mouette)

New and updated translations:

- Osama Khalid [ar]
- Amitakhya Phukan [as]
- Thanos Lefteris, Simos Xenitellis [el]
- Jorge González [es]
- Claude Paroz [fr]
- Shankar Prasad [kn]
- Miloš Popović [sr.po, sr@latin]

New and updated manual translations:

- Felix Riemann [de]
- Marios Zindilis [el]
- Claude Paroz [fr]