better date parsing

backend/src/workers/issued_at_months.rs

@@ -0,0 +1,15 @@
+pub(super) struct MonthVariant {
+    pub name: &'static str,
+    pub month: u32,
+    pub locales: &'static [&'static str],
+}
+
+include!(concat!(env!("OUT_DIR"), "/issued_at_months.rs"));
+
+pub(super) fn pattern() -> &'static str {
+    MONTH_PATTERN
+}
+
+pub(super) fn variants() -> &'static [MonthVariant] {
+    MONTH_VARIANTS
+}