Merge branch 'Hotfix/920-multiSelect' into 'Sprint/2020-13'

Fix: Removed duplicate keys (coscine/issues#920)

See merge request coscine/app/i18n!18

src/apps/resourcecontentview.ts

@@ -73,7 +73,6 @@ const appLanguageStrings = {
     errorLoadingResource: 'The resource could not be loaded.',
     tableIsEmpty: 'There are currently no entities for this resource.',
 
-    multiselectPlaceholder: 'Please select!',
     metadataManager: 'Metadata Manager',
     allFiles: 'All Files',
 
@@ -172,7 +171,6 @@ const appLanguageStrings = {
     errorLoadingResource: 'Die Ressource konnte nicht geladen werden.',
     tableIsEmpty: 'Es existieren aktuell noch keine Einträge für diese Ressource.',
 
-    multiselectPlaceholder: 'Bitte auswählen!',
     metadataManager: 'Metadaten Manager',
     allFiles: 'Alle Dateien',