Merge branch 'prolegomen/dev' into 'master'

Fix: support medias without url

See merge request !26 (merged)

(cherry picked from commit 96e5b1f9)

11d4f178 fix changelog a9c67dd5 update Readme 2c999873 add database schema 3b7ac3a9 fix misc. && remove dead code part3 762a8f45 edit changelog 57e5ae8d remove useless method 6981b963 import medias from cloud servers 7215bef4 fix routing, guess media types 964bf547 cloud media proxy 76836566 fix build js 2a9352ef file icons c2996b8d show tags in tei editor 96b7702c Merge branch 'master' of gitlab.com:litt-arts-num/tact into cloud-tei-icons 4b3549ec Translation to French 98d8acdb Minor fix 96491bd2 fix debug 1941327c upload fixes 0f0bbd7a change saved name for cloud files bcc3c813 Minor translation change 8ec5cca2 rewrite uploaded medias acad03e3 support upload other medias from cloud 4dbddd45 Merge branch 'cloud-tei-icons' into 'dev' 044cf510 support medias without url