Log Message:
Update to 38.3.0

Changelog:
    New Saved files tab now implements Search field and Clear button.
    Fixed (Right-)Clicking on a newsgroup now allows directly composing a \ 
message again
    Fixed Importing to the address book from CSV now works with international \ 
characters
    Fixed Thunderbird no longer crashes when executing filter rules when using \ 
maildir
    Fixed When using the maildir storage format, the INBOX folder is no longer \ 
deleted
    Fixed Emails with long References headers are now decoded correctly
    Fixed Checking for new messages correctly works after hibernation again
    Fixed Chat entries are no longer sometimes lost in global database at shutdown.