Enh: Added abstract `ContentContainerActiveRecord::getDisplayNameSub()`
Enh: Allow `humhub\modules\files\widgets\Upload::withName($submitName, $cfg);`
Enh: Auto add `data-container-id` to Space and User `Image` widget
'Add a user' is the correct form in English. Use of 'a' or 'an' are not determined by spelling, but pronunciation. Any word which sounds like it begins with a vowel (it may or may not actually begin with a vowel) will take 'an' and any word which begins with sound of a consonant will take 'a' as the preceding article.
