i18n: localize welcome screen

docs/CHANGELOG.md

@@ -25,6 +25,8 @@
 - Join, leave, and nickname-change system messages now use a dedicated
   `system_message` module, follow the sender's session language, and keep
   `:mute-joins` filtering compatible with both Chinese and English logs.
+- The interactive welcome screen now follows the selected UI language,
+  including the narrow-terminal fallback.
 
 ### Changed
 - NORMAL mode now opens at the latest visible messages instead of the oldest

include/i18n.h

@@ -7,6 +7,9 @@ typedef enum {
     I18N_USERNAME_PROMPT,
     I18N_INVALID_USERNAME,
     I18N_ROOM_FULL,
+    I18N_WELCOME_SUBTITLE,
+    I18N_WELCOME_TAGLINE,
+    I18N_WELCOME_FALLBACK_FORMAT,
     I18N_INSERT_HINT_WIDE,
     I18N_INSERT_HINT_NARROW,
     I18N_NORMAL_LATEST,

src/i18n.c

@@ -77,6 +77,12 @@ const char *i18n_text(help_lang_t lang, i18n_text_id_t id) {
                 return "用户名无效，已改用 anonymous。\r\n";
             case I18N_ROOM_FULL:
                 return "房间已满\r\n";
+            case I18N_WELCOME_SUBTITLE:
+                return "匿名聊天室 · SSH";
+            case I18N_WELCOME_TAGLINE:
+                return "键盘友好的终端交流";
+            case I18N_WELCOME_FALLBACK_FORMAT:
+                return "TNT %s - SSH 匿名聊天室\r\n\r\n";
             case I18N_INSERT_HINT_WIDE:
                 return "Enter 发送 · Esc 浏览 · :support";
             case I18N_INSERT_HINT_NARROW:
@@ -158,6 +164,12 @@ const char *i18n_text(help_lang_t lang, i18n_text_id_t id) {
             return "Invalid username. Using 'anonymous' instead.\r\n";
         case I18N_ROOM_FULL:
             return "Room is full\r\n";
+        case I18N_WELCOME_SUBTITLE:
+            return "anonymous chat · SSH";
+        case I18N_WELCOME_TAGLINE:
+            return "keyboard-first terminal chat";
+        case I18N_WELCOME_FALLBACK_FORMAT:
+            return "TNT %s - anonymous chat over SSH\r\n\r\n";
         case I18N_INSERT_HINT_WIDE:
             return "Enter send · Esc browse · :support";
         case I18N_INSERT_HINT_NARROW:

src/tui.c

@@ -153,8 +153,8 @@ void tui_render_welcome(client_t *client) {
 
     /* Lines, in display order.  Width is computed in display columns. */
     const char *line1 = "TNT · " TNT_VERSION;
-    const char *line2 = "匿名聊天室 · SSH";
-    const char *line3 = "Anonymous chat over SSH";
+    const char *line2 = i18n_text(client->help_lang, I18N_WELCOME_SUBTITLE);
+    const char *line3 = i18n_text(client->help_lang, I18N_WELCOME_TAGLINE);
 
     int inner_w = utf8_string_width(line1);
     int w2 = utf8_string_width(line2);
@@ -165,11 +165,13 @@ void tui_render_welcome(client_t *client) {
 
     /* Fall back to plain prompt if the terminal is too narrow for the frame. */
     if (inner_w + 2 > rw) {
+        char fallback_text[96];
         char fallback[128];
-        int n = snprintf(fallback, sizeof(fallback),
-                         ANSI_CLEAR ANSI_HOME
-                         "TNT %s — anonymous chat over SSH\r\n\r\n",
-                         TNT_VERSION);
+        snprintf(fallback_text, sizeof(fallback_text),
+                 i18n_text(client->help_lang, I18N_WELCOME_FALLBACK_FORMAT),
+                 TNT_VERSION);
+        int n = snprintf(fallback, sizeof(fallback), ANSI_CLEAR ANSI_HOME "%s",
+                         fallback_text);
         if (n > 0) client_send(client, fallback, (size_t)n);
         return;
     }

tests/unit/test_i18n.c

@@ -62,6 +62,10 @@ TEST(text_lookup_matches_language) {
                   "display name") != NULL);
     assert(strstr(i18n_text(LANG_ZH, I18N_USERNAME_PROMPT),
                   "用户名") != NULL);
+    assert(strstr(i18n_text(LANG_EN, I18N_WELCOME_SUBTITLE),
+                  "anonymous chat") != NULL);
+    assert(strstr(i18n_text(LANG_ZH, I18N_WELCOME_SUBTITLE),
+                  "匿名聊天室") != NULL);
     assert(strstr(i18n_text(LANG_EN, I18N_HELP_STATUS_FORMAT),
                   "HELP") != NULL);
     assert(strstr(i18n_text(LANG_ZH, I18N_HELP_STATUS_FORMAT),