Recalculate the issues on language changes (#3262)

## Problem

When the language changes, the issues are not updated to the new
language.

## Solution

* Add a `SetLocale` message to each service.
* Recalculate the issues when changing the language.

## Open questions

* Should we keep the SetLocale messages in those services where it is a
no-op?
* At some point, we should unify the `SetLocale` and `SetConfig<T>`
messages. Not as part of this PR, though.
 
## Testing

- Tested manually

Author: imobachgs

rust/agama-bootloader/src/message.rs

@@ -60,3 +60,20 @@ impl SetKernelArg {
         Self { id, value }
     }
 }
+
+#[derive(Clone)]
+pub struct SetLocale {
+    pub locale: String,
+}
+
+impl SetLocale {
+    pub fn new(locale: &str) -> Self {
+        Self {
+            locale: locale.to_string(),
+        }
+    }
+}
+
+impl Message for SetLocale {
+    type Reply = ();
+}

rust/agama-bootloader/src/service.rs

@@ -122,3 +122,10 @@ impl MessageHandler<message::SetKernelArg> for Service {
         Ok(())
     }
 }
+
+#[async_trait]
+impl MessageHandler<message::SetLocale> for Service {
+    async fn handle(&mut self, _message: message::SetLocale) -> Result<(), Error> {
+        Ok(())
+    }
+}

rust/agama-files/src/message.rs

@@ -67,3 +67,20 @@ pub struct WriteFiles;
 impl Message for WriteFiles {
     type Reply = ();
 }
+
+#[derive(Clone)]
+pub struct SetLocale {
+    pub locale: String,
+}
+
+impl SetLocale {
+    pub fn new(locale: &str) -> Self {
+        Self {
+            locale: locale.to_string(),
+        }
+    }
+}
+
+impl Message for SetLocale {
+    type Reply = ();
+}

rust/agama-files/src/service.rs

@@ -244,3 +244,10 @@ impl MessageHandler<message::WriteFiles> for Service {
         Ok(())
     }
 }
+
+#[async_trait]
+impl MessageHandler<message::SetLocale> for Service {
+    async fn handle(&mut self, _message: message::SetLocale) -> Result<(), Error> {
+        Ok(())
+    }
+}

rust/agama-hostname/src/message.rs

@@ -97,3 +97,20 @@ pub struct Install;
 impl Message for Install {
     type Reply = ();
 }
+
+#[derive(Clone)]
+pub struct SetLocale {
+    pub locale: String,
+}
+
+impl SetLocale {
+    pub fn new(locale: &str) -> Self {
+        Self {
+            locale: locale.to_string(),
+        }
+    }
+}
+
+impl Message for SetLocale {
+    type Reply = ();
+}

rust/agama-hostname/src/service.rs

@@ -274,3 +274,10 @@ impl MessageHandler<message::Install> for Service {
         self.model.install()
     }
 }
+
+#[async_trait]
+impl MessageHandler<message::SetLocale> for Service {
+    async fn handle(&mut self, _message: message::SetLocale) -> Result<(), Error> {
+        Ok(())
+    }
+}

rust/agama-iscsi/src/message.rs

@@ -64,3 +64,20 @@ impl SetConfig {
 impl Message for SetConfig {
     type Reply = ();
 }
+
+#[derive(Clone)]
+pub struct SetLocale {
+    pub locale: String,
+}
+
+impl SetLocale {
+    pub fn new(locale: &str) -> Self {
+        Self {
+            locale: locale.to_string(),
+        }
+    }
+}
+
+impl Message for SetLocale {
+    type Reply = ();
+}

rust/agama-iscsi/src/service.rs

@@ -143,3 +143,10 @@ impl MessageHandler<message::SetConfig> for Service {
         Ok(())
     }
 }
+
+#[async_trait]
+impl MessageHandler<message::SetLocale> for Service {
+    async fn handle(&mut self, _message: message::SetLocale) -> Result<(), Error> {
+        Ok(())
+    }
+}

rust/agama-manager/src/service.rs

@@ -508,8 +508,15 @@ impl Service {
             .call(l10n::message::SetSystem::new(config.clone()))
             .await?;
         if let Some(locale) = config.locale {
+            self.software
+                .cast(software::message::SetLocale::new(locale.as_str()))?;
             self.storage
                 .cast(storage::message::SetLocale::new(locale.as_str()))?;
+            self.users
+                .cast(users::message::SetLocale::new(locale.as_str()))?;
+            if let Some(s390) = &self.s390 {
+                s390.cast(s390::message::SetLocale::new(locale.as_str()))?;
+            }
         }
         Ok(())
     }

rust/agama-network/src/action.rs

@@ -96,4 +96,6 @@ pub enum Action {
     RemoveConnection(String, Responder<Result<(), NetworkStateError>>),
     /// Apply the current configuration.
     Apply(Responder<Result<(), NetworkAdapterError>>),
+    /// Sets the locale
+    SetLocale(String),
 }