I guess it's because I have different local than USA
Steps to Reproduce:
2. deselect all language packs except one
3. see there is no titles
expected well working program!
User Profile Reset: No
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0
This looks like a case of bug 107166. It should already be fixed in the release version of 5.4.0... to be sure you could check 126.96.36.199 from  (likely to be released as 5.4.1 in a few days).
There are a couple of remaining corner cases that are discussed in the later parts of bug 107166.
*** This bug has been marked as a duplicate of bug 107166 ***