Responsive: small screen fixes

Center accession image horizontally on small screen
=> Add class justify-content-center on row https://forgemia.inra.fr/urgi-is/gpds/blob/master/frontend/src/app/germplasm-card/germplasm-card.component.html#L159
Add non breakable space   in result section title (otherwise the: wraps to a new line on small screens)
=> s/Results :/Results :/ https://forgemia.inra.fr/urgi-is/gpds/blob/master/frontend/src/app/result-page/result-page.component.html#L50
Add space to break text in Acquisition/Creation date (otherwise the text overflows in small screens)
=> s|Acquisition/Creation date|Acquisition / Creation date| https://forgemia.inra.fr/urgi-is/gpds/blob/master/frontend/src/app/germplasm-card/germplasm-card.component.html#L403
Fix accession image popover placement on small screen. As-is, it overflows to the right of the screen with no possibility to scroll
Re-layout the trait widget for small screens (might be difficult!)

Edited Mar 20, 2019 by Guillaume Cornut

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