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Fix #32: report Fluent (.ftl) parse errors with file:line:column Parse errors in errors-*.ftl were logged as raw byte offsets (ParserError { pos: 45000..45001, ... }), which is useless for finding the problem in a large localisation file. Recover the source via FluentResource::source(), convert the byte offset to a 1-based line/column, and log file:line:column, the human-readable Fluent message, and a snippet of the offending line. This immediately surfaces the real bugs in errors-se.ftl (a "€" typo'd for "$" in {$1}, a missing "=", a leading tab). Add a line_col unit test.