Update bitcoinstrings from core and English source translation file

This is necessary as any strings have changed since last time.

Also the python script used to extract bitcoinstrings.cpp, extract_strings_qt.py
now sorts the strings before generating the output file. This results in more
deterministic output and thus smaller diffs.

share/qt/extract_strings_qt.py

@@ -5,6 +5,7 @@ they can be picked up by Qt linguist.
 '''
 from subprocess import Popen, PIPE
 import glob
+import operator
 
 OUT_CPP="src/qt/bitcoinstrings.cpp"
 EMPTY=['""']
@@ -62,7 +63,8 @@ f.write("""#include <QtGlobal>
 #define UNUSED
 #endif
 """)
-f.write('static const char UNUSED *bitcoin_strings[] = {')
+f.write('static const char UNUSED *bitcoin_strings[] = {\n')
+messages.sort(key=operator.itemgetter(0))
 for (msgid, msgstr) in messages:
     if msgid != EMPTY:
         f.write('QT_TRANSLATE_NOOP("bitcoin-core", %s),\n' % ('\n'.join(msgid)))