[FIX] Trackers, date and time field: Selectors (the child elements) were stacked horizontally. Added Bootstrap inline form classes.

[FIX] Trackers, date and time field: Selectors (the child elements) were stacked horizontally. Added Bootstrap inline form classes.

https://stackoverflow.com/questions/28786475/how-to-put-multiple-bootstrap-inputs-on-same-line/43439623

PS: new commit on master following discussion !522 (closed)