chatgui: localize file drop hints and attachment rejection messages

tools/chatgui/src/inputbar.cpp

@@ -220,7 +220,7 @@ void InputBar::installFileDropTarget(QWidget* target) {
     target->setAcceptDrops(true);
     target->installEventFilter(this);
     m_dropTargets.insert(target);
-    connect(target, &QObject::destroyed, this, [this, target] { m_dropTargets.remove(target); });
+    if (target != this) connect(target, &QObject::destroyed, this, [this, target] { m_dropTargets.remove(target); });
     GUI_DEBUG("InputBar: file drop target installed class=%s", target->metaObject()->className());
 }
 

tools/chatgui/translations/chatgui_en.ts

@@ -2115,5 +2115,12 @@ Directories: %5</translation>
     <message><source>Cannot update group avatar</source><translation>Cannot update group avatar</translation></message>
     <message><source>Group avatar updated</source><translation>Group avatar updated</translation></message>
     <message><source>Chat is stopped</source><translation>Chat is stopped</translation></message>
+    <message><source>Drop a file to attach</source><translation>Drop a file to attach</translation></message>
+    <message><source>Drop one file at a time.</source><translation>Drop one file at a time.</translation></message>
+    <message><source>Only local files can be attached.</source><translation>Only local files can be attached.</translation></message>
+    <message><source>Attachment cancelled: the chat changed or attachments are unavailable.</source><translation>Attachment cancelled: the chat changed or attachments are unavailable.</translation></message>
+    <message><source>Select an existing, readable file.</source><translation>Select an existing, readable file.</translation></message>
+    <message><source>Cannot attach an empty file.</source><translation>Cannot attach an empty file.</translation></message>
+    <message><source>Cannot create the attachment directory.</source><translation>Cannot create the attachment directory.</translation></message>
 </context>
 </TS>

tools/chatgui/translations/chatgui_ru.ts

@@ -2115,5 +2115,12 @@ Directories: %5</source>
     <message><source>Cannot update group avatar</source><translation>Не удалось изменить аватарку группы</translation></message>
     <message><source>Group avatar updated</source><translation>Аватарка группы обновлена</translation></message>
     <message><source>Chat is stopped</source><translation>Чат остановлен</translation></message>
+    <message><source>Drop a file to attach</source><translation>Перетащите файл для прикрепления</translation></message>
+    <message><source>Drop one file at a time.</source><translation>Перетаскивайте по одному файлу.</translation></message>
+    <message><source>Only local files can be attached.</source><translation>Можно прикреплять только локальные файлы.</translation></message>
+    <message><source>Attachment cancelled: the chat changed or attachments are unavailable.</source><translation>Прикрепление отменено: чат изменился или вложения недоступны.</translation></message>
+    <message><source>Select an existing, readable file.</source><translation>Выберите существующий файл, доступный для чтения.</translation></message>
+    <message><source>Cannot attach an empty file.</source><translation>Нельзя прикрепить пустой файл.</translation></message>
+    <message><source>Cannot create the attachment directory.</source><translation>Не удалось создать каталог для вложения.</translation></message>
 </context>
 </TS>