Update translations for bitcoin core

- Move scripts/qt to share/qt, to clean up toplevel directories
- Update english ts file which is used to source messages for Transifex
- In extract_strings_qt.py use a glob *.h *.cpp, this is safe now that the Wx UI files are removed

share/qt/extract_strings_qt.py

@@ -0,0 +1,64 @@
+#!/usr/bin/python
+'''
+Extract _("...") strings for translation and convert to Qt4 stringdefs so that
+they can be picked up by Qt linguist.
+'''
+from subprocess import Popen, PIPE
+import glob
+
+OUT_CPP="src/qt/bitcoinstrings.cpp"
+EMPTY=['""']
+
+def parse_po(text):
+    """
+    Parse 'po' format produced by xgettext.
+    Return a list of (msgid,msgstr) tuples.
+    """
+    messages = []
+    msgid = []
+    msgstr = []
+    in_msgid = False
+    in_msgstr = False
+
+    for line in text.split('\n'):
+        line = line.rstrip('\r')
+        if line.startswith('msgid '):
+            if in_msgstr:
+                messages.append((msgid, msgstr))
+                in_msgstr = False
+            # message start
+            in_msgid = True
+            
+            msgid = [line[6:]]
+        elif line.startswith('msgstr '):
+            in_msgid = False
+            in_msgstr = True
+            msgstr = [line[7:]]
+        elif line.startswith('"'):
+            if in_msgid:
+                msgid.append(line)
+            if in_msgstr:
+                msgstr.append(line)
+
+    if in_msgstr:
+        messages.append((msgid, msgstr))
+
+    return messages
+
+files = glob.glob('src/*.cpp') + glob.glob('src/*.h') 
+
+# xgettext -n --keyword=_ $FILES
+child = Popen(['xgettext','--output=-','-n','--keyword=_'] + files, stdout=PIPE)
+(out, err) = child.communicate()
+
+messages = parse_po(out) 
+
+f = open(OUT_CPP, 'w')
+f.write('#include <QtGlobal>\n')
+f.write('// Automatically generated by extract_strings.py\n')
+f.write('static const char *bitcoin_strings[] = {')
+for (msgid, msgstr) in messages:
+    if msgid != EMPTY:
+        f.write('QT_TRANSLATE_NOOP("bitcoin-core", %s),\n' % ('\n'.join(msgid)))
+f.write('};')
+f.close()