IcuCollation::$tailoringFirstLetters: 'sv', 'vi' verified

* sv: per Lejonel in comments on bug 45446
* vi: per Minh Nguyễn in comments on bug 45979

Change-Id: I96bbcd73e75f9fc85a5c0b402eae87e5cda2259e
Merge "IcuCollation::$tailoringFirstLetters: 'sv', 'vi' verified"