Add translators to the credits dialog

- Add tooling at //tools/i18n to generate the file with the information
  about the translators: //src/json/i18n-credits.json.
- Change credits.json to remove an entry from a translator, who is now
  mentioned in the i18n credits.
- Change Makefile and release.bash to incorporate the i18n credit
  generation in the process of building the extension.
- Change options page to accommodate the translators section.

Change-Id: I7f3991f9c456c381832f4a7bebdfc5581ef9e4be
diff --git a/Makefile b/Makefile
index 3f174f1..98aec15 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,15 @@
-.PHONY: all chromium-stable chromium-beta
+.PHONY: all i18n-credits chromium-stable chromium-beta
 all: chromium-stable chromium-beta
-	bash release.bash -c stable -b chromium
+	bash generatei18nCredits.bash
-	bash release.bash -c beta -b chromium
+chromium-stable: i18n-credits
+	bash release.bash -c stable -b chromium -f
+chromium-beta: i18n-credits
+	bash release.bash -c beta -b chromium -f
 	rm -rf out