Update rocket_i18n and add gettext_macros (#431)

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

templates/instance/about.rs.html

@@ -5,7 +5,7 @@
 
 @(ctx: BaseContext, instance: Instance, admin: User, n_users: i64, n_articles: i64, n_instances: i64)
 
-@:base(ctx, i18n!(ctx.1, "About {0}"; instance.name.clone()).as_str(), {}, {}, {
+@:base(ctx, i18n!(ctx.1, "About {0}"; instance.name.clone()), {}, {}, {
     <h1>@i18n!(ctx.1, "About {0}"; instance.name)</h1>
     <section>
     @Html(instance.short_description_html)

templates/instance/admin.rs.html

@@ -7,7 +7,7 @@
 
 @(ctx: BaseContext, instance: Instance, form: InstanceSettingsForm, errors: ValidationErrors)
 
-@:base(ctx, i18n!(ctx.1, "Administration of {0}"; instance.name.clone()).as_str(), {}, {}, {
+@:base(ctx, i18n!(ctx.1, "Administration of {0}"; instance.name.clone()), {}, {}, {
   <h1>@i18n!(ctx.1, "Administration")</h1>
 
   @tabs(&[

templates/instance/federated.rs.html

@@ -5,7 +5,7 @@
 
 @(ctx: BaseContext, articles: Vec<Post>, page: i32, n_pages: i32)
 
-@:base(ctx, "All the articles of the Fediverse", {}, {}, {
+@:base(ctx, i18n!(ctx.1, "All the articles of the Fediverse"), {}, {}, {
 <div class="h-feed">
   <h1 "p-name">@i18n!(ctx.1, "All the articles of the Fediverse")</h1>
 

templates/instance/feed.rs.html

@@ -5,7 +5,7 @@
 
 @(ctx: BaseContext, articles: Vec<Post>, page: i32, n_pages: i32)
 
-@:base(ctx, "Your feed", {}, {}, {
+@:base(ctx, i18n!(ctx.1, "Your feed"), {}, {}, {
   <h1>@i18n!(ctx.1, "Your feed")</h1>
 
     @tabs(&[

templates/instance/index.rs.html

@@ -6,7 +6,7 @@
 
 @(ctx: BaseContext, instance: Instance, n_users: i64, n_articles: i64, local: Vec<Post>, federated: Vec<Post>, user_feed: Option<Vec<Post>>)
 
-@:base(ctx, instance.name.clone().as_ref(), {}, {}, {
+@:base(ctx, instance.name.clone(), {}, {}, {
   <h1>@i18n!(ctx.1, "Welcome on {}"; instance.name.as_str())</h1>
 
      @if ctx.2.is_some() {
@@ -17,9 +17,9 @@
             (&uri!(instance::local: _).to_string(), i18n!(ctx.1, "Local feed"), false),
         ])
 
-        @:home_feed(ctx, user_feed.unwrap_or_default(), &uri!(instance::feed: _).to_string(), "Your feed")
-        @:home_feed(ctx, federated, &uri!(instance::federated: _).to_string(), "Federated feed")
-        @:home_feed(ctx, local, &uri!(instance::local: _).to_string(), "Local feed")
+        @:home_feed(ctx, user_feed.unwrap_or_default(), &uri!(instance::feed: _).to_string(), i18n!(ctx.1, "Your feed"))
+        @:home_feed(ctx, federated, &uri!(instance::federated: _).to_string(), i18n!(ctx.1, "Federated feed"))
+        @:home_feed(ctx, local, &uri!(instance::local: _).to_string(), i18n!(ctx.1, "Local feed"))
         @:instance_description(ctx, instance, n_users, n_articles)
     } else {
         @tabs(&[
@@ -28,8 +28,8 @@
             (&uri!(instance::local: _).to_string(), i18n!(ctx.1, "Local feed"), false),
         ])
 
-        @:home_feed(ctx, federated, &uri!(instance::federated: _).to_string(), "Federated feed")
-        @:home_feed(ctx, local, &uri!(instance::local: _).to_string(), "Local feed")
+        @:home_feed(ctx, federated, &uri!(instance::federated: _).to_string(), i18n!(ctx.1, "Federated feed"))
+        @:home_feed(ctx, local, &uri!(instance::local: _).to_string(), i18n!(ctx.1, "Local feed"))
         @:instance_description(ctx, instance, n_users, n_articles)
     }
 })

templates/instance/list.rs.html

@@ -5,7 +5,7 @@
 
 @(ctx: BaseContext, instance: Instance, instances: Vec<Instance>, page: i32, n_pages: i32)
 
-@:base(ctx, i18n!(ctx.1, "Administration of {0}"; instance.name.clone()).as_str(), {}, {}, {
+@:base(ctx, i18n!(ctx.1, "Administration of {0}"; instance.name.clone()), {}, {}, {
     <h1>@i18n!(ctx.1, "Instances")</h1>
 
     @tabs(&[
@@ -23,7 +23,7 @@
                 </p>
                 @if !instance.local {
                     <form class="inline" method="post" action="@uri!(instance::toggle_block: id = instance.id)">
-                        <input type="submit" value="@i18n!(ctx.1, if instance.blocked { "Unblock" } else { "Block"})">
+                        <input type="submit" value="@if instance.blocked { @i18n!(ctx.1, "Unblock") } else { @i18n!(ctx.1, "Block") }">
                     </form>
                 }
             </div>

templates/instance/local.rs.html

@@ -6,7 +6,7 @@
 
 @(ctx: BaseContext, instance: Instance, articles: Vec<Post>, page: i32, n_pages: i32)
 
-@:base(ctx, i18n!(ctx.1, "Articles from {}"; instance.name.clone()).as_str(), {}, {}, {
+@:base(ctx, i18n!(ctx.1, "Articles from {}"; instance.name.clone()), {}, {}, {
 <div class="h-feed">
   <h1 class="p-name">@i18n!(ctx.1, "Articles from {}"; instance.name)</h1>
 

templates/instance/users.rs.html

@@ -5,7 +5,7 @@
 
 @(ctx: BaseContext, users: Vec<User>, page: i32, n_pages: i32)
 
-@:base(ctx, "Users", {}, {}, {
+@:base(ctx, i18n!(ctx.1, "Users"), {}, {}, {
     <h1>@i18n!(ctx.1, "Users")</h1>
 
     @tabs(&[