With BS3, if a column was supposed to be aligned on the right, using
the 'pull-right' class on it did the trick.
With BS4, this is not the case anymore as .row elements use flex.
This commit use one of those 3 solutions case per case:
- If the column was alone on its row, then adding the
'justify-content-end' class on the row.
- If the column was not alone on its row, then adding the 'ml-auto'
class on the column instead.
- If the column was already filling the row, there was no point in
aligning it to the right
Note: this commit does not case about potential xpath which would add
new columns in one of those rows. If any, this can be handled as a fix
later.