diff --git a/padelnomics/src/padelnomics/app.py b/padelnomics/src/padelnomics/app.py
index 8397540..ec69728 100644
--- a/padelnomics/src/padelnomics/app.py
+++ b/padelnomics/src/padelnomics/app.py
@@ -54,6 +54,15 @@ def _fmt_n(n) -> str:
     return f"{round(float(n)):,}".replace(",", ".")
 
 
+def _tformat(s: str, **kwargs) -> str:
+    """Format a translation string with named placeholders.
+
+    Usage: {{ t.some_key | tformat(count=total, name=supplier.name) }}
+    JSON value: "Browse {count}+ suppliers from {name}"
+    """
+    return s.format_map(kwargs)
+
+
 def create_app() -> Quart:
     """Create and configure the Quart application."""
 
@@ -67,12 +76,13 @@ def create_app() -> Quart:
 
     app.secret_key = config.SECRET_KEY
 
-    # Jinja2 filters for financial formatting (used in planner templates)
+    # Jinja2 filters
     app.jinja_env.filters["fmt_currency"] = _fmt_currency
     app.jinja_env.filters["fmt_k"] = _fmt_k
     app.jinja_env.filters["fmt_pct"] = _fmt_pct
     app.jinja_env.filters["fmt_x"] = _fmt_x
     app.jinja_env.filters["fmt_n"] = _fmt_n
+    app.jinja_env.filters["tformat"] = _tformat  # translate with placeholders: {{ t.key | tformat(count=n) }}
 
     # Session config
     app.config["SESSION_COOKIE_SECURE"] = not config.DEBUG