Update rocket_i18n and add gettext_macros (#431)

Internationalization now uses proc-macros that generate the .pot file
automatically.

templates/posts/details.rs.html

@@ -11,7 +11,7 @@
 
 @(ctx: BaseContext, article: Post, blog: Blog, comment_form: &NewCommentForm, comment_errors: ValidationErrors, tags: Vec<Tag>, comments: Vec<CommentTree>, previous_comment: Option<Comment>, n_likes: i64, n_reshares: i64, has_liked: bool, has_reshared: bool, is_following: bool, author: User)
 
-@:base(ctx, &article.title.clone(), {
+@:base(ctx, article.title.clone(), {
     <meta property="og:title" content="@article.title"/>
     <meta property="og:type" content="article"/>
     @if article.cover_id.is_some() {
@@ -87,7 +87,7 @@
         @if ctx.2.is_some() {
             <div class="actions">
                 <form class="likes" action="@uri!(likes::create: blog = blog.get_fqn(ctx.0), slug = &article.slug)" method="POST">
-                    <p aria-label="@i18n!(ctx.1, "One like", "{0} likes", &n_likes)" title="@i18n!(ctx.1, "One like", "{0} likes", n_likes)">
+                    <p aria-label="@i18n!(ctx.1, "One like", "{0} likes"; n_likes)" title="@i18n!(ctx.1, "One like", "{0} likes"; n_likes)">
                         @n_likes
                     </p>
 
@@ -98,7 +98,7 @@
                     }
                 </form>
                 <form class="reshares" action="@uri!(reshares::create: blog = blog.get_fqn(ctx.0), slug = &article.slug)" method="POST">
-                    <p aria-label="@i18n!(ctx.1, "One boost", "{0} boost", &n_reshares)" title="@i18n!(ctx.1, "One boost", "{0} boosts", n_reshares)">
+                    <p aria-label="@i18n!(ctx.1, "One boost", "{0} boost"; n_reshares)" title="@i18n!(ctx.1, "One boost", "{0} boosts"; n_reshares)">
                         @n_reshares
                     </p>
 
@@ -113,14 +113,14 @@
             <p class="center">@i18n!(ctx.1, "Login or use your Fediverse account to interact with this article")</p>
             <div class="actions">
                 <div class="likes">
-                    <p aria-label="@i18n!(ctx.1, "One like", "{0} likes", &n_likes)" title="@i18n!(ctx.1, "One like", "{0} likes", n_likes)">
+                    <p aria-label="@i18n!(ctx.1, "One like", "{0} likes"; n_likes)" title="@i18n!(ctx.1, "One like", "{0} likes"; n_likes)">
                         @n_likes
                     </p>
 		    <a href="@uri!(session::new: m = i18n!(ctx.1, "Login to like"))" class="action">@icon!("heart") @i18n!(ctx.1, "Add yours")</a>
                 </div>
 
                 <div class="reshares">
-                    <p aria-label="@i18n!(ctx.1, "One boost", "{0} boost", &n_reshares)" title="@i18n!(ctx.1, "One boost", "{0} boosts", n_reshares)">
+                    <p aria-label="@i18n!(ctx.1, "One boost", "{0} boost"; n_reshares)" title="@i18n!(ctx.1, "One boost", "{0} boosts"; n_reshares)">
                         @n_reshares
                     </p>
                     <a href="@uri!(session::new: m = i18n!(ctx.1, "Login to boost"))" class="action">@icon!("repeat") @i18n!(ctx.1, "Boost")</a>

templates/posts/new.rs.html

@@ -8,16 +8,10 @@
 @use routes::posts::NewPostForm;
 @use routes::*;
 
-@(ctx: BaseContext, blog: Blog, editing: bool, form: &NewPostForm, is_draft: bool, article: Option<Post>, errors: ValidationErrors, medias: Vec<Media>, content_len: u64)
+@(ctx: BaseContext, title: String, blog: Blog, editing: bool, form: &NewPostForm, is_draft: bool, article: Option<Post>, errors: ValidationErrors, medias: Vec<Media>, content_len: u64)
 
-@:base(ctx, &i18n!(ctx.1, if editing { "Edit {0}" } else { "New post" }; &form.title), {}, {}, {
-    <h1>
-        @if editing {
-            @i18n!(ctx.1, "Edit {0}"; &form.title)
-        } else {
-            @i18n!(ctx.1, "Create a new post")
-        }
-    </h1>
+@:base(ctx, title.clone(), {}, {}, {
+    <h1>@title</h1>
     @if let Some(article) = article {
 	    <form id="post-form" class="new-post" method="post" action="@uri!(posts::update: blog = blog.actor_id, slug = &article.slug)" content-size="@content_len">
     } else {
@@ -27,7 +21,7 @@
         @input!(ctx.1, subtitle (optional text), "Subtitle", form, errors.clone(), "")
 
         @if let Some(ValidationErrorsKind::Field(errs)) = errors.clone().errors().get("content") {
-            @format!(r#"<p class="error">{}</p>"#, i18n!(ctx.1, &*errs[0].message.clone().unwrap_or(Cow::from("Unknown error"))))
+            @format!(r#"<p class="error">{}</p>"#, errs[0].message.clone().unwrap_or(Cow::from("Unknown error")))
         }
 
         <label for="plume-editor">@i18n!(ctx.1, "Content")<small>@i18n!(ctx.1, "Markdown syntax is supported")</small></label>