Merge branch 'tl/pack-bitmap-error-messages'

Merge branch 'tl/pack-bitmap-error-messages'

Tweak various messages that come from the pack-bitmap codepaths.

* tl/pack-bitmap-error-messages:
  pack-bitmap.c: continue looping when first MIDX bitmap is found
  pack-bitmap.c: using error() instead of silently returning -1
  pack-bitmap.c: do not ignore error when opening a bitmap file
  pack-bitmap.c: rename "idx_name" to "bitmap_name"
  pack-bitmap.c: mark more strings for translations
  pack-bitmap.c: fix formatting of error messages