[ryanchou1994]

Fixes #1266.

Problem

write_po() puts each value on the same line as its keyword (msgstr "..."), but normalize() only compared the quoted string plus the line prefix against width. The keyword itself was never counted. With the 116-character msgstr from the issue and pybabel update -w 120, the quoted string is 118 characters, so it was treated as fitting and written as a single 125-character line (and an already wrapped value was un-wrapped).

Change

• normalize() gets an optional first_line_offset argument (default 0, so existing callers get the same output as before).
• When a single-line value fits on its own line but not after its keyword, it is written in the multi-line form (msgstr "" followed by the value on the next line), the same layout already used for wrapped values.
• A value that is too long even on its own line (e.g. one long word) keeps the old output, since moving it would not help.
• _format_message passes the keyword length through a small _format_field helper, so msgctxt, msgid, msgid_plural, msgstr, msgstr[N] and obsolete (#~ ) entries are all covered.

Note that this changes output for values whose length falls in the last few columns before width (counting the keyword): they now start on their own line. Running pybabel update on an existing catalog will reflow those entries once.

Not changed on purpose: the conflict writer _format_conflict (used by concat/merge), and #| msgid previous-id comments.

Tests

• test_wrap_long_msgstr_including_keyword: the case from the issue at width=120.
• test_wrap_keyword_lines_within_width: context, plural and obsolete entries at width=40, asserting no line exceeds the width.

Both fail on master (ecf1da8) and pass with this change. Full run on Linux (Python 3.14, CLDR 48.2 imported with scripts/download_import_cldr.py): pytest tests babel/messages/pofile.py --doctest-modules goes from 6618 to 6620 passed, no failures.

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