Improve sed detection in update-locales.sh

[silverwind]

• Make scripts work from any directory
• Detect sed version just like Makefile does

[silverwind]

Had to temporarily disable -e because BSD sed will exit non-zero for a --version argument, in fact it has no way to show its version:

$ /usr/bin/sed --version; echo $?
/usr/bin/sed: illegal option -- -
usage: sed script [-Ealnru] [-i extension] [file ...]
  sed [-Ealnu] [-i extension] [-e script] ... [-f script_file] ... [file ...]
1

[silverwind]

Removed the cd related changes. The scripts run under /bin/sh so bash variables were not there and I'm not 100% sure I can switch these scripts to bash because it's not present in alpine for example. So this is only the sed change now.

[wxiaoguang]

I didn't know where this script runs in. If it runs in the environment without bash (really? it's 2023 now ...), I think we should also revert the shebang line to #!/bin/sh.

ps: I didn't see today's crowdin sync commit, does it mean that this script failed because I used bash in last PR?
I want to mention some maintainers but I don't know who knows the crwodin sync infrastructure ....

[lunny]

I think it's copied from Makefile and it works well before with no gsed installation requirement.

[silverwind]

Alpine is pretty much the only environment in use today that does not have bash unless manually installed. I also don't know where/how this script runs. Maybe @techknowlogick has some insight.

[wxiaoguang]

I think we need to take this fix with the shebang line fix .... 😂

[silverwind]

As I suspected, this step is running on alpine:3.17, so it needs sh (busybox). I hope the script is sh-compatible.

[silverwind]

Need to merge this to un-break the translation updates.