record: fix adding new file with record from within a subdir (issue4626) In my latest change on record (edit newly added file), I forgot the repo.wjoin() so that record was not computing the paths properly to delete the backups and was crashing.

tests: fix backslashes in test-casefolding

cmdutil: avoid wrapping ctx.phasestr() by _() This wrapping seems meaningless, because: - there is no "_()" invocation to prepare for extracting phase names to be translated "make update-pot" doesn't extract msgids for phase names - phase names are kine of reserved keywords like as branch name "default"

repair: avoid string concatenation by + operator String concatenation by "+" operator causes failure of extracting messages to be translated. Python automatically concatenates strings separated by whitespaces into one string.