Bad display of Tests table in a Test Execution

The Tests columns from the Test section in Test Executions will overlap with the information on the right side pan whenever there are many or wide columns being shown. 

reproduced on Chrome Version 62.0.3202.75 (Build officiel) (64 bits) and Firefox 56.0.2 (64 bits)

very visible, especially when we display a lot of entries

Note: this may also happen in other sections

Note: This must also be addressed in the Test Plan Tests table