The phone header gave each link an equal minmax(0, 1fr) column and
allowed overflow-wrap: anywhere, so single-word labels such as
"Showcases", "Anleitungen", "Руководства" and "Посібники" broke between
letters at 320-430px. Links now share the row as flex items that never
shrink below their longest word. Labels wrap only at spaces, and a word
wider than the whole row can still break, preserving the enlarged-text
fit from #3598.
Refs #3597
Pirro Zani
313af7119c
