feat(frontend): add i18n messages and error codes for profile feature

Add profile_* message keys for the profile page forms in de/en/es.
Add EMAIL_ALREADY_IN_USE and WRONG_CURRENT_PASSWORD to ErrorCode type and
getErrorMessage switch.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/messages/en.json

@@ -1,6 +1,5 @@
 {
 	"$schema": "https://inlang.com/schema/inlang-message-format",
-
 	"error_document_not_found": "Document not found.",
 	"error_document_no_file": "No file is associated with this document.",
 	"error_file_not_found": "The file could not be found in storage.",
@@ -11,13 +10,11 @@
 	"error_forbidden": "You do not have permission for this action.",
 	"error_validation_error": "The input is invalid.",
 	"error_internal_error": "An unexpected error occurred.",
-
 	"nav_documents": "Documents",
 	"nav_persons": "Persons",
 	"nav_conversations": "Conversations",
 	"nav_admin": "Admin",
 	"nav_logout": "Sign out",
-
 	"btn_save": "Save",
 	"btn_cancel": "Cancel",
 	"btn_edit": "Edit",
@@ -26,7 +23,6 @@
 	"btn_back_to_overview": "Back to overview",
 	"btn_back": "Back",
 	"btn_back_to_document": "Back to document",
-
 	"form_label_first_name": "First name",
 	"form_label_last_name": "Last name",
 	"form_label_alias": "Nickname / Alias",
@@ -47,12 +43,10 @@
 	"form_label_archive_location": "Storage location",
 	"form_placeholder_archive_location": "e.g. Cabinet 3, Folder B",
 	"form_helper_archive_location": "Where is the original document stored?",
-
 	"login_heading": "Sign in",
 	"login_label_username": "Username",
 	"login_label_password": "Password",
 	"login_btn_submit": "Sign in",
-
 	"docs_search_placeholder": "Search in title, content, location...",
 	"docs_btn_filter": "Filter",
 	"docs_btn_reset_title": "Reset filter",
@@ -68,7 +62,6 @@
 	"docs_list_from": "From",
 	"docs_list_to": "To",
 	"docs_list_unknown": "Unknown",
-
 	"doc_section_who_when": "Who & When",
 	"doc_section_description": "Description",
 	"doc_section_file": "File",
@@ -79,7 +72,6 @@
 	"doc_current_file_label": "Current file:",
 	"doc_new_heading": "New document",
 	"doc_edit_heading": "Edit",
-
 	"doc_section_details": "Details",
 	"doc_label_document_date": "Document date",
 	"doc_label_creation_location": "Place of creation",
@@ -92,17 +84,14 @@
 	"doc_loading": "Loading document...",
 	"doc_download_link": "Try direct download",
 	"doc_no_scan": "No scan available",
-
 	"persons_heading": "Person directory",
 	"persons_subtitle": "Browse the index of all recorded persons in the family archive.",
 	"persons_btn_new": "New person",
 	"persons_search_placeholder": "Search names...",
 	"persons_empty_heading": "No persons found.",
 	"persons_empty_text": "Try a different search term.",
-
 	"persons_new_heading": "New person",
 	"persons_section_details": "Person details",
-
 	"person_edit_heading": "Edit person",
 	"person_label_full_name": "Full name",
 	"person_merge_heading": "Merge person",
@@ -126,7 +115,6 @@
 	"person_role_receiver": "Received",
 	"person_co_correspondents_heading": "Frequent correspondents",
 	"person_show_more": "+ {count} more",
-
 	"conv_heading": "Conversations",
 	"conv_subtitle": "Follow the correspondence between two persons chronologically.",
 	"conv_label_person_a": "Person A (Sender)",
@@ -143,7 +131,6 @@
 	"conv_swap_btn": "Swap persons",
 	"conv_summary": "{count} documents · {yearFrom}–{yearTo}",
 	"conv_new_doc_link": "New document in this correspondence",
-
 	"admin_heading": "Admin Dashboard",
 	"admin_tab_users": "Users",
 	"admin_tab_groups": "Groups",
@@ -172,7 +159,6 @@
 	"admin_section_new_group": "Create new group",
 	"admin_group_name_placeholder": "Group name (e.g. Editors)",
 	"admin_user_delete_confirm": "Really delete user {username}?",
-
 	"doc_file_error_preview": "Could not load preview.",
 	"doc_download_title": "Download",
 	"doc_tag_filter_title": "Filter by {name}",
@@ -180,9 +166,7 @@
 	"doc_preview_iframe_title": "Document Preview",
 	"doc_image_alt": "Original scan",
 	"doc_no_date": "No date",
-
 	"person_merge_will_be_deleted": "will be deleted.",
-
 	"comp_typeahead_placeholder": "Type a name...",
 	"comp_typeahead_loading": "Searching...",
 	"comp_multiselect_placeholder": "Type a name...",
@@ -191,5 +175,24 @@
 	"comp_taginput_placeholder_create": "Add tags...",
 	"comp_taginput_placeholder_filter": "Filter by tags...",
 	"comp_taginput_remove": "Remove tag",
-	"comp_taginput_create_hint": "Press Enter to create tag."
+	"comp_taginput_create_hint": "Press Enter to create tag.",
+	"error_email_already_in_use": "This email address is already used by another account.",
+	"error_wrong_current_password": "The current password is incorrect.",
+	"nav_profile": "Profile",
+	"profile_heading": "My Profile",
+	"profile_section_personal": "Personal Information",
+	"profile_label_first_name": "First name",
+	"profile_label_last_name": "Last name",
+	"profile_label_birth_date": "Date of birth",
+	"profile_label_email": "Email address",
+	"profile_label_contact": "Contact details",
+	"profile_contact_placeholder": "Phone, address or other notes...",
+	"profile_section_password": "Change password",
+	"profile_label_current_password": "Current password",
+	"profile_label_new_password": "New password",
+	"profile_label_new_password_confirm": "New password (repeat)",
+	"profile_password_mismatch": "The new passwords do not match.",
+	"profile_saved": "Saved.",
+	"profile_password_changed": "Password changed successfully.",
+	"user_profile_heading": "Profile of"
 }