[gtranslator] (15 commits) ...Merge branch 'pack_start' into 'master'

[Daniel Garcia Moreno <danigm src gnome org>]

Summary of changes:

  df7870d... utils: Create tmp api to help gtk4 migration
  4dc1051... assistant: Replace pack_start use
  7c9d978... assistant: Set align
  cf56963... assistant: Replace remaining container API
  67f6faa... close-confirmation-dialog: Remove pack_start
  14e8745... close-confirmation-dialog: Remove border_width
  bbc4263... tab-label: Remove container api
  da65734... Remove remaining uses of gtk_box_pack_start
  11935f9... remove remaining uses of border-width
  4375f32... Replace remaining border with in UI files
  b6829e3... replace margin-{left,right} > margin-{start,end}
  ca6288a... Remove remaining uses of container_add for boxes
  cc575fb... Set margin in container, not in dialog
  0be504b... confirmation dialog: Set margin in container
  57ab4f6... Merge branch 'pack_start' into 'master'