[loc] use a single rufus.loc as translator base

* Remove the need to maintain a new_translation.loc
* Add a sed invocation to remove comments and unwanted stuff
  to generate a final embedded.loc
* Note: sed is only invoked for MinGW.
  MS compilers still embed the unmodified rufus.loc.
* Also fix a small bug when parsing the version.

res/localization/embedded.sed

@@ -0,0 +1,17 @@
+# This sed script removes everything we don't need from rufus.loc, for embedding.
+
+# remove comments (aggressively!)
+s/#.*$//
+
+# remove empty lines
+/^$/d
+
+# remove trailing whitespaces
+s/[ \t]*$//
+
+# remove the UI controls for "en-US" as they are just here for translators
+# 1,300 means we only do this for the the first 300 lines
+1,300 {/g IDD_DIALOG/,/g IDD_MESSAGES/{/g IDD_MESSAGES/!d}}
+
+# output file *MUST* be CR/LF
+s/$/\r/