refactor install script

Fix missing translation back to top - Only develop branch

the script is now split up in parts that will be fetched from github
on demand.
fixes #4047

Fix reactions link on mobile broken. Close #3972

Fix select & deselect all aspects check image

show username of the services in the publisher

original work by @Ruxton
rebased and extended to include feedback from the original PR #3959

Embed associated photos into the status message xml

Refactor script/server

Update gems