feat(templates): add localized push templates and actions

Share template keys across email and push with independent editors and revisions. Render localized actions and preserve version-one delivery.

Ref: IT-1627

HrynCo.NotificationService.Web/Views/AdminPushTemplates/Delete.cshtml

@@ -0,0 +1,12 @@
+@model HrynCo.NotificationService.Web.Controllers.Admin.ViewModels.PushTemplateEditViewModel
+@{ ViewData["Title"] = "Delete Push Template"; }
+<h1 class="h3">Delete Push Template</h1>
+<p>Delete the Push template <strong>@Model.Key</strong> and its @Model.Languages.Count language versions from <strong>@Model.ServiceName</strong>? The Email template is retained.</p>
+<form method="post" asp-action="Delete" asp-route-serviceId="@Model.ServiceId">
+    @Html.AntiForgeryToken()
+    <input asp-for="Key" type="hidden" /><input asp-for="Revision" type="hidden" /><input asp-for="KeyFilter" type="hidden" />
+    <div asp-validation-summary="All" class="text-danger" role="alert"></div>
+    <div class="form-check my-3"><input asp-for="ConfirmDelete" class="form-check-input" /><label asp-for="ConfirmDelete" class="form-check-label">Confirm deletion of this Push template and its translations</label></div>
+    <button class="btn btn-danger" type="submit">Delete Push Template</button>
+    <a class="btn btn-secondary" href="@Url.Action("Index", "AdminTemplates", new { serviceId = Model.ServiceId, key = Model.KeyFilter })">Cancel</a>
+</form>