You could edit localized strings in RadaeePDF SDK by editing Localizable.string in iOS and .xml in Android

RadaeePDF iOS Tiled - ENG (before v4):

../PDFViewer/en.lproj/Localizable.string

RadaeePDF iOS Cordova - ENG:

../com.radaee.cordova/src/ios/PDFViewer/en.lproj/Localizable.string

RadaeePDF iOS Xamarin - ENG:

../RadaeePDF-Xamarin/ios/RDPDFViewXamarin/ReaderXamarin/Resources/en.lproj

RadaeePDF Android

Structure is always:

ViewLib/src/main/res/values/strings.xml (default)

ViewLib/src/main/res/values-XXX/strings.xml (for every possible translation where XXX is language code)

RadaeePDF Android Cordova:

platforms/android/app/src/main/res/values/strings.xml (default)

platforms/android/app/src/main/res/values-XXX/strings.xml (for every possible translation where XXX is language code)

RadaeePDF Android Xamarin:

Resources/values/strings.xml (default)

Resources/values-XXX/strings.xml (for every possible translation where XXX is language code)

File's structure: "key" = "value";