Merge the initial l10n effort in

* l10n: Update l10n guide: change the repository URL, etc l10n: leave leading space unchanged for zh_CN.po Update l10n guide l10n: update Chinese translation to the new git.po l10n: Update git.pot (12 new messages) l10n: fast-forward here is ff-only merge, not push l10n: update zh_CN translation for "Fetching %s" l10n: po for zh_CN l10n: initial git.pot for 1.7.10 upcoming release