issue: https://github.com/goldendict/goldendict/issues/1441

http://tango.freedesktop.org/Tango_Desktop_Project GPLv3
list:
internet.svg
home.svg
configure.svg
system-search.svg
fileopen.svg
addtab.svg
wizard.svg
fulltext
text2speech
reload 
icons/print.svg
icons/programs.svg
error
star.svg
star_blue.svg
network.svg

https://commons.wikimedia.org/wiki/GNOME_Desktop_icons GPLv3
lists:
windows-list.svg
interface.svg
closetab.svg
advanced
folder.svg
previous.svg
next.svg
reload.svg
icon32_zoomin.svg
icon32_zoomout.svg
icon32_zoombase.svg
hotkeys.svg
filesave.svg
playsound_color.svg
webdict
transliteration
clear.svg

https://commons.wikimedia.org/wiki/File:Accessories-dictionary.svg
lists:
icon32_sdict.svg 


https://freesvg.org/pushpin-vector-image  public domain 
lists:
pushbin


https://commons.wikimedia.org/wiki/File:Arrow_bottom_svg.svg  license:public domain
lists:
1downarrow