ResearchLogger: make logging more reliable (esp on startup)

java/res/values/strings.xml

java/src/com/android/inputmethod/latin/LatinIME.java

java/src/com/android/inputmethod/latin/ResearchLog.java

java/src/com/android/inputmethod/latin/ResearchLogger.java

java/src/com/android/inputmethod/latin/Settings.java