search-box.ihtml not tracked by check-translation script?

[Federico Bruni]

Any reason why search-box.ihtml is in Documentation/ instead of 
Documentation/en?
It seems it's causing troubles to the check-translation script:

$ cd Documentation
$ make ISOLANG=fr check-translation | grep 'diff --git'
warning: fr/search-box.ihtml: 128 fatal: path 
'Documentation/en/search-box.ihtml' does not exist in 'HEAD'