Fix misaligned theme action modal text

Seems like this was caused in !1089 (merged) while fixing #688 (closed) (theme action buttons disappearing when screen size is too small). That fix involved the use of text-right instead of pull-right to align buttons to the right. The text-right class applies to all child elements, including the modals, which are also in the div containing the buttons. I fixed this by applying the text-left class to the modals.

Also, it seems like the fix for #688 (closed) was only implemented for themes, but thesis projects were also affected in the same way. I fixed that bug for thesis projects too.

Closes #742 (closed)