Wait
It happens from time to time… Usually SW/support people notice problem in short time by themselves and correct it.
Thus take a deep breath and wait.
WARN:Couldn’t read the status file: [string “backend”]:1211: [string “backend”]:277: attempt to concatenate local ‘pkg_name’ (a nil value)
INFO:Target Turris OS: 5.2.7
WARN:Requested package luci-i18n-rainbow-de that is missing, ignoring as requested.
WARN:Requested package foris-storage-plugin-l10n-de that is missing, ignoring as requested.
WARN:Requested package reforis-snapshots-plugin-l10n-de that is missing, ignoring as requested.
WARN:Requested package reforis-diagnostics-plugin-l10n-de that is missing, ignoring as requested.
WARN:Requested package luci-i18n-rainbow-en that is missing, ignoring as requested.
WARN:Requested package luci-i18n-rainbow-cs that is missing, ignoring as requested.
line not found
line not found
line not found
ERROR:
[string “backend”]:1211: [string “backend”]:277: attempt to concatenate local ‘pkg_name’ (a nil value)
Which is completely unrelated to this issue. What OP needs to do is to reach the support department with the diagnostics and also share the content of /etc/updater/conf.d as it seems that he was doing some changes in files.