Convert *.strings to UTF-16 at build time.
<http://developer.apple.com/documentation/MacOSX/Conceptual/BPInternational/Articles/StringsFiles.html>
"Note: Strings files encoded using UTF-8 are not guaranteed to work.
When in doubt, encode the file using UTF-16."
However, Git does not display readable diffs for UTF-16 files.
So keep *.strings files as UTF-8 in the source tree, but convert
them to UTF-16 during the build.
Not all the strings files in the source tree are in UTF-8 yet,
and not all of the UTF-8 ones begin with a byte-order mark.
I intend to convert files to UTF-8 with BOM as I modify them.