Allow using localized absolute date times within phrases with place holders and localize issue due date events (#24275)

This refactors the `shared/datetime/short|long|full` templates into a
template helper function, which allows us to render absolute date times
within translatable phrases.

- Follows #23988
- The first attempt was in #24055
- This should help #22664 

Changes:
1. Added the `DateTime` template helper that replaces the
`shared/datetime/short|long|full` templates
2. Used find-and-replace with varying regexes to replace the templates
from step 1 (for example, `\{\{template "shared/datetime/(\S+) \(dict
"Datetime" ([^"]+) "Fallback" ([^\)]+\)?) ?\)?\}\}` -> `{{DateTime "$1
$2 $3}}`)
3. Used the new `DateTime` helper in the issue due date timestamp
rendering

# Before

![image](https://user-images.githubusercontent.com/20454870/233791256-b454c455-aca0-4b76-b300-7866c7bd529e.png)

# After

![image](https://user-images.githubusercontent.com/20454870/233790809-c4913355-2822-4657-bb29-2298deb6d4b3.png)

---------

Signed-off-by: Yarden Shoham <git@yardenshoham.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/package/view.tmpl

@@ -86,7 +86,7 @@
 							{{range .LatestVersions}}
 								<div class="item gt-df">
 									<a class="gt-f1" href="{{$.PackageDescriptor.PackageWebLink}}/{{PathEscape .LowerVersion}}">{{.Version}}</a>
-									<span class="text small">{{template "shared/datetime/short" (dict "Datetime" (.CreatedUnix.FormatDate) "Fallback" (.CreatedUnix.FormatDate))}}</span>
+									<span class="text small">{{DateTime "short" (.CreatedUnix.FormatDate) (.CreatedUnix.FormatDate)}}</span>
 								</div>
 							{{end}}
 							</div>