libgphoto2 2.5.30 release

ptp2:
* Canon: fixed display locking/unlocking after exit
* generic: avoid potential crash on image addition
* Sony: Add image information when wait_for_event, some config values added
* Added IDs:
  * Nikon Zfc, Z9
  * Sony DSC-WX220, Alpha-A7 IV
  * Nikon P950
  * Canon EOS Rebel T8i
  * Fuji Fujifilm X-E4
  * GoPro HERO10 Black

general:
* fix parallel builds by requiring gettext 0.19.1 for builds from git (PR #797)
* add gp_init_localedir() function to allow for non-standard installations (PR #796)

translations:
* updated traditional chinese
