align all SVG strings
remove unnecessary spaces in SVG strings
remove version and xmlns attars from SVG icons

they only seem to be necessary when embedding in an XML document, and
we only deal with HTML
Fix ES translations for key 'add_new_association'
Merge pull request #3459 from epdp/fix_es_translation_for_has_many_new

Fix ES translations for key 'add_new_association'
at least align the SVGs missing an ID

not sure if the ID should actually be added :-/