feat: add concise English timeago messages

- Implemented concise timeago messages
- Added no prefixes, suffixes instead
- Used abbreviations for units

Author: fulleni

lib/shared/localization/en_timeago_messages.dart

@@ -0,0 +1,43 @@
+import 'package:timeago/timeago.dart' as timeago;
+
+/// Custom English lookup messages for the timeago package (concise).
+class EnTimeagoMessages implements timeago.LookupMessages {
+  @override
+  String prefixAgo() => ''; // No prefix
+  @override
+  String prefixFromNow() => ''; // No prefix
+  @override
+  String suffixAgo() => ' ago'; // Suffix instead
+  @override
+  String suffixFromNow() => ' from now'; // Suffix instead
+
+  @override
+  String lessThanOneMinute(int seconds) => 'now';
+  @override
+  String aboutAMinute(int minutes) => '1m';
+  @override
+  String minutes(int minutes) => '${minutes}m';
+
+  @override
+  String aboutAnHour(int minutes) => '1h';
+  @override
+  String hours(int hours) => '${hours}h';
+
+  @override
+  String aDay(int hours) => '1d';
+  @override
+  String days(int days) => '${days}d';
+
+  @override
+  String aboutAMonth(int days) => '1mo';
+  @override
+  String months(int months) => '${months}mo';
+
+  @override
+  String aboutAYear(int year) => '1y';
+  @override
+  String years(int years) => '${years}y';
+
+  @override
+  String wordSeparator() => ' ';
+}