[i18n] Use redgettext over pygettext (#2023)

* [i18n] Use redgettext over pygettext

* Clear out autogenerated `messages.pot` files

* Remove redundant `regen_messages.py` files

* Refactor `generate_strings.py` to use redgettext

* Install redgettext in Travis Crowdin job

* Clean up some problematic usages of gettext function

* Reformat

* Replace generate_strings.py with Makefile argument

* Update to redgettext 2.1, use exclusion pattern

Signed-off-by: Toby Harradine <tobyharradine@gmail.com>

redbot/cogs/dataconverter/locales/messages.pot

@@ -1,43 +0,0 @@
-# SOME DESCRIPTIVE TITLE.
-# Copyright (C) YEAR ORGANIZATION
-# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
-#
-msgid ""
-msgstr ""
-"Project-Id-Version: PACKAGE VERSION\n"
-"POT-Creation-Date: 2018-03-12 04:35+EDT\n"
-"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
-"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
-"Language-Team: LANGUAGE <LL@li.org>\n"
-"MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=CHARSET\n"
-"Content-Transfer-Encoding: ENCODING\n"
-"Generated-By: pygettext.py 1.5\n"
-
-
-#: ../dataconverter.py:38
-msgid "There don't seem to be any data files I know how to handle here. Are you sure you gave me the base installation path?"
-msgstr ""
-
-#: ../dataconverter.py:43
-msgid "Please select a set of data to import by number, or 'exit' to exit"
-msgstr ""
-
-#: ../dataconverter.py:59
-msgid "Try this again when you are more ready"
-msgstr ""
-
-#: ../dataconverter.py:70
-msgid "That wasn't a valid choice."
-msgstr ""
-
-#: ../dataconverter.py:76
-msgid "{} converted."
-msgstr ""
-
-#: ../dataconverter.py:80
-msgid ""
-"There isn't anything else I know how to convert here.\n"
-"There might be more things I can convert in the future."
-msgstr ""
-

redbot/cogs/dataconverter/locales/regen_messages.py

@@ -1,11 +0,0 @@
-import subprocess
-
-TO_TRANSLATE = ["../dataconverter.py"]
-
-
-def regen_messages():
-    subprocess.run(["pygettext", "-n"] + TO_TRANSLATE)
-
-
-if __name__ == "__main__":
-    regen_messages()