Why Lasarus tries to save PO files in ISO-8859-1 ?

[mm7]

When a resourcestring changed, Lasarus merges that into PO files. The PO files should be UTF-8.
But Lazarus shows error messages like the following:

Saving file "/fs02/home/mark/MyProjects/freeship-plus-in-lazarus/locale/FreeShip.cn.po" as "ISO-8859-1" looses characters at line 2851, column 5.

If I click [Cancel] it may leave the file with 0 length.
If I click [Ignore] it saves somewhat UTF-8, but some characters saved in ISO.

It happens when a resourcestring  has a non ISO-8859-1 chars.
Like UTF-8 degree sign °. Instead of writing hex C2 B0, it writes just B0.

I tried to find if non-ISO-8859-1 chars are prohibited in resourcestrings.
I could not find it neither in Lasarus nor in GetText docs.

What to do?

[mm7]

I figured this out.
It is weird, though.
The PO files must have following header.

Code: Text  [Select][+][-]

1. # FreeShip for Lazarus
2. # Copyright (C) 2024 Free Software Foundation, Inc.
3. # Author <email>, 2024.
4. msgid ""
5. msgstr ""
6. "Project-Id-Version: \n"
7. "PO-Revision-Date: 2024-08-15 21:22-0400\n"
8. "Last-Translator: AUTHOR <email>\n"
9. "Language-Team: TEAM <email>\n"
10. "Language: Language\n"
11. "MIME-Version: 1.0\n"
12. "Content-Type: text/plain; charset=UTF-8\n"
13. "Content-Transfer-Encoding: 8bit\n"
14.  

Not sure which fields are critical, but previously there was just
"Content-Type: text/plain; charset=UTF-8\n"
And it was not enough. Lazarus saved mixed UTF-8 and ISO corrupted files.