[#888] Manually applying changes from feature branch

See:

https://github.com/akvo/akvo-flow/commit/8816626d31ce3aeb5a2db2258dc271562841e1e5
[#908] Release notes v1.7.6.2

Contains the multiple barcode functionality
Merge branch 'release/1.7.6'
 Please enter a commit message to explain why this merge is necessary,