Prepare 3.54 from git

Add git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git submodule

git submodule add \
    git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git man-pages-git

Sync to upstream 70caf370.
Reset to 9ee4a2b6^1 (before s/file system/filesystem/)

We'll process in 3 steps:
1/ all translations until this point
2/ then unfuzzy all changes due to 9ee4a2b6
3/ then translate the remaning part
Reset to 9ee4a2b6 (s/file system/filesystem/)

2 steps remaining:
1/ unfuzzy all changes due to 9ee4a2b6
2/ then translate the remaning part
Update to upstream 70caf37, as unfuzzy is finished
Update to upstream 69e8f02f
Remove man-pages-git submodule and set V to 3.54
Merge remote-tracking branch 'upstream/master'