i18n: títulos de pestaña por idioma (metadata -> generateMetadata)

Los <title> estáticos estaban en español fijo. Se migran 31 páginas a
generateMetadata reutilizando la clave de título ya traducida de cada página
(o del <h1>). Se traducen además los PageShell title hardcodeados de las 6
páginas CharServiceB y los títulos de download-client y changelogs (+ su
mensaje de error). tsc/build OK, paridad es/en, <title> cambia por idioma.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-next/messages/en.json

@@ -892,7 +892,8 @@
       "noteConfirm": "Please make sure you have chosen the correct character, as this action cannot be undone once performed.",
       "requires": "Requires <s>{price}</s> <y>€</y> (SumUp)",
       "payLabel": "CHANGE FACTION",
-      "confirm": "Are you sure you want to change the selected character’s faction for {price} € (SumUp)?"
+      "confirm": "Are you sure you want to change the selected character’s faction for {price} € (SumUp)?",
+      "title": "Change character faction"
     },
     "changeRace": {
       "warning": "THIS CHANGE DOES NOT ALLOW SWITCHING TO THE OPPOSITE FACTION",
@@ -905,7 +906,8 @@
       "noteConfirm": "Please make sure you have chosen the correct character, as this action cannot be undone once performed.",
       "requires": "Requires <s>{price}</s> <y>€</y> (SumUp)",
       "payLabel": "CHANGE RACE",
-      "confirm": "Are you sure you want to change the selected character’s race for {price} € (SumUp)?"
+      "confirm": "Are you sure you want to change the selected character’s race for {price} € (SumUp)?",
+      "title": "Change character race"
     },
     "customize": {
       "intro": "The <s>Customize character</s> tool lets you change the following aspects of a character:",
@@ -922,7 +924,8 @@
       "noteConfirm": "Please make sure you have chosen the correct character, as this action cannot be undone once performed.",
       "requires": "Requires <s>{price}</s> <y>€</y> (SumUp)",
       "payLabel": "CUSTOMIZE",
-      "confirm": "Are you sure you want to customize the selected character for {price} € (SumUp)?"
+      "confirm": "Are you sure you want to customize the selected character for {price} € (SumUp)?",
+      "title": "Customize character"
     },
     "levelUp": {
       "intro": "The <s>Level up to 80</s> tool lets you raise any character to level 80.",
@@ -934,7 +937,8 @@
       "noteConfirm": "Please make sure you have chosen the correct character, as this action cannot be undone once performed.",
       "requires": "Requires <s>{price}</s> <y>€</y> (SumUp)",
       "payLabel": "LEVEL UP TO 80",
-      "confirm": "Are you sure you want to level the selected character up to 80 for {price} € (SumUp)?"
+      "confirm": "Are you sure you want to level the selected character up to 80 for {price} € (SumUp)?",
+      "title": "Level up to 80"
     },
     "gold": {
       "intro": "The <s>Acquire gold</s> tool lets you send gold to a character.",
@@ -942,7 +946,8 @@
       "mailInfo": "When you log into the realm with that character, you will have the message with the selected amount of gold in your mailbox.",
       "noteLegend": "NOTE",
       "noteConfirm": "Please make sure you have chosen the correct character, as this action cannot be undone once performed.",
-      "requiresLabel": "Requires"
+      "requiresLabel": "Requires",
+      "title": "Acquire gold"
     },
     "rename": {
       "intro": "The <s>Rename character</s> tool lets you change a character's name.",
@@ -952,7 +957,8 @@
       "noteConfirm": "Please make sure you have chosen the correct character, as this action cannot be undone once performed.",
       "requires": "Requires <s>{price}</s> <y>€</y> (SumUp)",
       "payLabel": "RENAME",
-      "confirm": "Are you sure you want to rename the selected character for {price} € (SumUp)?"
+      "confirm": "Are you sure you want to rename the selected character for {price} € (SumUp)?",
+      "title": "Rename character"
     }
   },
   "History": {
@@ -1371,6 +1377,10 @@
       "emailTitle": "Email",
       "email1": "The server has different email addresses dedicated to different server topics.",
       "email2": "Depending on your problem, use the appropriate one to send us an email message."
+    },
+    "changelogs": {
+      "title": "Changelogs",
+      "loadError": "The changelog could not be loaded right now."
     }
   },
   "Points": {
@@ -1785,7 +1795,8 @@
       "macStep8": "8 - The client will start automatically.",
       "macStep9": "9 - Once you finish and exit the client, click \"Done\" in the CrossOver application.",
       "macStep10": "10 - The next time you want to return, open the CrossOver application, look at the left panel and select the WoW that was previously created in Bottle, and click RUN COMMAND, select WoW.exe and click ¨Save command as launcher¨, then click Open.",
-      "macStep11": "11 - Finally, you will see the WoW icon under the WoW Bottle tab; now you can drag the WoW launcher to the Dock, so that next time you want to log in, you simply run WoW from the Dock."
+      "macStep11": "11 - Finally, you will see the WoW icon under the WoW Bottle tab; now you can drag the WoW launcher to the Dock, so that next time you want to log in, you simply run WoW from the Dock.",
+      "pageTitle": "Download the client"
     },
     "cookie": {
       "dialogLabel": "Cookie consent",