scmutil: extract helper functions that returns human-readable change id We do "'%d:%s' % (ctx...)" at several places, so let's formalize it. A low- level function, formatrevnode(ui, rev, node), is extracted so we can pass a manifest rev/node pair. Note that hex() for manifest output can be replaced with hexfunc() because it is printed only when debugflag is set. i18n/de.po is updated so test-log.t passes with no error.