Fix Sanskrit translation not being used when selected (#17820)

It is still a very partial translation, though, and the localeData I added is
very partial as well, but at least it now uses the strings that actually got
translated, instead of using English strings.

app/javascript/mastodon/locales/locale-data/sa.js

@@ -0,0 +1,97 @@
+/*eslint eqeqeq: "off"*/
+/*eslint no-nested-ternary: "off"*/
+/*eslint quotes: "off"*/
+/*eslint comma-dangle: "off"*/
+/*eslint semi: "off"*/
+
+export default [
+  {
+    locale: "sa",
+    fields: {
+      year: {
+        displayName: "year",
+        relative: {
+          0: "this year",
+          1: "next year",
+          "-1": "last year"
+        },
+        relativeTime: {
+          future: {
+            other: "+{0} y"
+          },
+          past: {
+            other: "-{0} y"
+          }
+        }
+      },
+      month: {
+        displayName: "month",
+        relative: {
+          0: "this month",
+          1: "next month",
+          "-1": "last month"
+        },
+        relativeTime: {
+          future: {
+            other: "+{0} m"
+          },
+          past: {
+            other: "-{0} m"
+          }
+        }
+      },
+      day: {
+        displayName: "day",
+        relative: {
+          0: "अद्य",
+          1: "श्वः",
+          "-1": "गतदिनम्"
+        },
+        relativeTime: {
+          future: {
+            other: "+{0} d"
+          },
+          past: {
+            other: "-{0} d"
+          }
+        }
+      },
+      hour: {
+        displayName: "hour",
+        relativeTime: {
+          future: {
+            other: "+{0} h"
+          },
+          past: {
+            other: "-{0} h"
+          }
+        }
+      },
+      minute: {
+        displayName: "minute",
+        relativeTime: {
+          future: {
+            other: "+{0} min"
+          },
+          past: {
+            other: "-{0} min"
+          }
+        }
+      },
+      second: {
+        displayName: "second",
+        relative: {
+          0: "now"
+        },
+        relativeTime: {
+          future: {
+            other: "+{0} s"
+          },
+          past: {
+            other: "-{0} s"
+          }
+        }
+      }
+    }
+  }
+]