source: josm/trunk/images/dialogs/about/google-plus.svg@ 13952

see #8011 - improve About dialog to promote translations:

• add direct link to Launchpad
• add image links to our different profiles on external sites (OSM diary and social medias)
• OSM icon: ​https://wiki.openstreetmap.org/wiki/File:Logo_simple.svg (CC SA 2.0)
• Social icons: ​https://github.com/Automattic/social-logos (GPLv2 or later)