Add CODEOWNERS and l10n.toml

CODEOWNERS

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+# flod as main contact for string changes
+locales/en/*.ftl @flodolo

l10n.toml

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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+basepath = "."
+
+locales = []
+
+[env]
+    l = "{l10n_base}/locales/{locale}/"
+
+[[paths]]
+    reference = "locales/en/**"
+    l10n = "{l}**"