Add Swahili language

plugins/discourse-local-dates/config/locales/client.sw.yml

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+# encoding: utf-8
+#
+# Never edit this file. It will be overwritten when translations are pulled from Transifex.
+#
+# To work with us on translations, join this project:
+# https://www.transifex.com/projects/p/discourse-org/
+
+sw:
+  js:
+    discourse_local_dates:
+      title: Andika tarehe
+      create:
+        modal_title: Andika tarehe
+        form:
+          insert: Weka
+          advanced_mode: Hali-tumizi ya juu
+          timezones_title: Majira za saa za kuonyeshwa
+          timezones_description: Majina ya saa yatatumika kuonyesha tarehe kwenye kihakiki na marejesho ya mfumo.
+          recurring_title: Kurudiarudia
+          recurring_none: Hakuna kurudia
+          invalid_date: Tarehe batili, hakikisha tarehe na mda viko sawa

plugins/discourse-local-dates/config/locales/server.sw.yml

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+# encoding: utf-8
+#
+# Never edit this file. It will be overwritten when translations are pulled from Transifex.
+#
+# To work with us on translations, join this project:
+# https://www.transifex.com/projects/p/discourse-org/
+
+sw:
+  site_settings:
+    discourse_local_dates_default_timezones: "Orodha  ya chaguo-msingi ya majira ya saa, lazima yawe sahihi <a target='_blank' rel='noopener' href='https://en.wikipedia.org/wiki/List_of_tz_database_time_zones'>TZ</a>"