diff --git a/src/click/_termui_impl.py b/src/click/_termui_impl.py
index 286271c8a..219fbaa1f 100644
--- a/src/click/_termui_impl.py
+++ b/src/click/_termui_impl.py
@@ -173,7 +173,13 @@ def format_eta(self) -> str:
             hours = t % 24
             t //= 24
             if t > 0:
-                return f"{t}d {hours:02}:{minutes:02}:{seconds:02}"
+                return "{d}{day_label} {h:02}:{m:02}:{s:02}".format(
+                    d=t,
+                    day_label=_("d"),
+                    h=hours,
+                    m=minutes,
+                    s=seconds,
+                )
             else:
                 return f"{hours:02}:{minutes:02}:{seconds:02}"
         return ""
diff --git a/src/click/_winconsole.py b/src/click/_winconsole.py
index e56c7c6ae..d25178d66 100644
--- a/src/click/_winconsole.py
+++ b/src/click/_winconsole.py
@@ -28,6 +28,7 @@
 from ctypes.wintypes import HANDLE
 from ctypes.wintypes import LPCWSTR
 from ctypes.wintypes import LPWSTR
+from gettext import gettext as _
 
 from ._compat import _NonClosingTextIOWrapper
 
@@ -152,7 +153,7 @@ def readinto(self, b: Buffer) -> int:
             # wait for KeyboardInterrupt
             time.sleep(0.1)
         if not rv:
-            raise OSError(f"Windows error: {GetLastError()}")
+            raise OSError(_("Windows error: {error}").format(error=GetLastError()))
 
         if buffer[0] == EOF:
             return 0
@@ -169,7 +170,7 @@ def _get_error_message(errno: int) -> str:
             return "ERROR_SUCCESS"
         elif errno == ERROR_NOT_ENOUGH_MEMORY:
             return "ERROR_NOT_ENOUGH_MEMORY"
-        return f"Windows error {errno}"
+        return _("Windows error: {error}").format(error=errno)
 
     def write(self, b: Buffer) -> int:
         bytes_to_be_written = len(b)
diff --git a/src/click/core.py b/src/click/core.py
index d915d92bc..c5cab15c0 100644
--- a/src/click/core.py
+++ b/src/click/core.py
@@ -1136,14 +1136,13 @@ def get_short_help_str(self, limit: int = 45) -> str:
             text = ""
 
         if self.deprecated:
+            localised_deprectated = _("deprecated").upper()
             deprecated_message = (
-                f"(DEPRECATED: {self.deprecated})"
+                f"({localised_deprectated}: {self.deprecated})"
                 if isinstance(self.deprecated, str)
-                else "(DEPRECATED)"
-            )
-            text = _("{text} {deprecated_message}").format(
-                text=text, deprecated_message=deprecated_message
+                else f"({localised_deprectated})"
             )
+            text = f"{_(text)} {deprecated_message}"
 
         return text.strip()
 
@@ -1173,14 +1172,13 @@ def format_help_text(self, ctx: Context, formatter: HelpFormatter) -> None:
             text = ""
 
         if self.deprecated:
+            localised_deprectated = _("deprecated").upper()
             deprecated_message = (
-                f"(DEPRECATED: {self.deprecated})"
+                f"({localised_deprectated}: {self.deprecated})"
                 if isinstance(self.deprecated, str)
-                else "(DEPRECATED)"
-            )
-            text = _("{text} {deprecated_message}").format(
-                text=text, deprecated_message=deprecated_message
+                else f"({localised_deprectated})"
             )
+            text = f"{_(text)} {deprecated_message}"
 
         if text:
             formatter.write_paragraph()
@@ -2984,7 +2982,7 @@ def _parse_decls(
         for decl in decls:
             if decl.isidentifier():
                 if name is not None:
-                    raise TypeError(f"Name '{name}' defined twice")
+                    raise TypeError(_("Name '{name}' defined twice").format(name=name))
                 name = decl
             else:
                 split_char = ";" if decl[:1] == "/" else "/"
@@ -2999,8 +2997,10 @@ def _parse_decls(
                         secondary_opts.append(second.lstrip())
                     if first == second:
                         raise ValueError(
-                            f"Boolean option {decl!r} cannot use the"
-                            " same flag for true/false."
+                            _(
+                                "Boolean option {decl!r} cannot use the"
+                                " same flag for true/false."
+                            ).format(decl=decl)
                         )
                 else:
                     possible_names.append(_split_opt(decl))
@@ -3016,14 +3016,18 @@ def _parse_decls(
             if not expose_value:
                 return "", opts, secondary_opts
             raise TypeError(
-                f"Could not determine name for option with declarations {decls!r}"
+                _(
+                    "Could not determine name for option with declarations {decls!r}"
+                ).format(decls=decls)
             )
 
         if not opts and not secondary_opts:
             raise TypeError(
-                f"No options defined but a name was passed ({name})."
-                " Did you mean to declare an argument instead? Did"
-                f" you mean to pass '--{name}'?"
+                _(
+                    "No options defined but a name was passed ({name})."
+                    " Did you mean to declare an argument instead? Did"
+                    " you mean to pass '--{name}'?"
+                ).format(name=name)
             )
 
         return name, opts, secondary_opts
@@ -3455,8 +3459,10 @@ def _parse_decls(
             name = name.replace("-", "_").lower()
         else:
             raise TypeError(
-                "Arguments take exactly one parameter declaration, got"
-                f" {len(decls)}: {decls}."
+                _(
+                    "Arguments take exactly one parameter declaration, got"
+                    " {length}: {decls}."
+                ).format(length=len(decls), decls=decls)
             )
         return name, [arg], []
 
diff --git a/src/click/decorators.py b/src/click/decorators.py
index 21f4c3422..14aee42ea 100644
--- a/src/click/decorators.py
+++ b/src/click/decorators.py
@@ -396,8 +396,8 @@ def callback(ctx: Context, param: Parameter, value: bool) -> None:
     kwargs.setdefault("is_flag", True)
     kwargs.setdefault("callback", callback)
     kwargs.setdefault("expose_value", False)
-    kwargs.setdefault("prompt", "Do you want to continue?")
-    kwargs.setdefault("help", "Confirm the action without prompting.")
+    kwargs.setdefault("prompt", _("Do you want to continue?"))
+    kwargs.setdefault("help", _("Confirm the action without prompting."))
     return option(*param_decls, **kwargs)
 
 
diff --git a/src/click/formatting.py b/src/click/formatting.py
index 0b64f831b..de2ca4711 100644
--- a/src/click/formatting.py
+++ b/src/click/formatting.py
@@ -153,7 +153,7 @@ def write_usage(self, prog: str, args: str = "", prefix: str | None = None) -> N
             ``"Usage: "``.
         """
         if prefix is None:
-            prefix = f"{_('Usage:')} "
+            prefix = "{usage} ".format(usage=_("Usage:"))
 
         usage_prefix = f"{prefix:>{self.current_indent}}{prog} "
         text_width = self.width - self.current_indent
diff --git a/src/click/parser.py b/src/click/parser.py
index 410d7fe10..4fcbf7caa 100644
--- a/src/click/parser.py
+++ b/src/click/parser.py
@@ -141,7 +141,11 @@ def __init__(
         for opt in opts:
             prefix, value = _split_opt(opt)
             if not prefix:
-                raise ValueError(f"Invalid start character for option ({opt})")
+                raise ValueError(
+                    _("Invalid start character for option ({option})").format(
+                        option=opt
+                    )
+                )
             self.prefixes.add(prefix[0])
             if len(prefix) == 1 and len(value) == 1:
                 self._short_opts.append(opt)
diff --git a/src/click/termui.py b/src/click/termui.py
index 892e4c0bc..08d732895 100644
--- a/src/click/termui.py
+++ b/src/click/termui.py
@@ -652,13 +652,13 @@ def style(
         try:
             bits.append(f"\033[{_interpret_color(fg)}m")
         except KeyError:
-            raise TypeError(f"Unknown color {fg!r}") from None
+            raise TypeError(_("Unknown color {colour!r}").format(colour=fg)) from None
 
     if bg:
         try:
             bits.append(f"\033[{_interpret_color(bg, 10)}m")
         except KeyError:
-            raise TypeError(f"Unknown color {bg!r}") from None
+            raise TypeError(_("Unknown color {colour!r}").format(colour=bg)) from None
 
     if bold is not None:
         bits.append(f"\033[{1 if bold else 22}m")
diff --git a/src/click/types.py b/src/click/types.py
index 355e98423..699bb31f5 100644
--- a/src/click/types.py
+++ b/src/click/types.py
@@ -390,7 +390,7 @@ def get_invalid_choice_message(self, value: t.Any, ctx: Context | None) -> str:
         ).format(value=value, choice=choices_str, choices=choices_str)
 
     def __repr__(self) -> str:
-        return f"Choice({list(self.choices)})"
+        return _("Choice({choices})").format(choices=list(self.choices))
 
     def shell_complete(
         self, ctx: Context, param: Parameter, incomplete: str
@@ -888,7 +888,11 @@ def convert(
 
             return f
         except OSError as e:
-            self.fail(f"'{format_filename(value)}': {e.strerror}", param, ctx)
+            self.fail(
+                f"'{format_filename(value)}': {e.strerror}",
+                param,
+                ctx,
+            )
 
     def shell_complete(
         self, ctx: Context, param: Parameter, incomplete: str
diff --git a/src/click/utils.py b/src/click/utils.py
index 89cae3b99..e2e3fe5f1 100644
--- a/src/click/utils.py
+++ b/src/click/utils.py
@@ -6,6 +6,7 @@
 import sys
 import typing as t
 from functools import update_wrapper
+from gettext import gettext as _
 from types import ModuleType
 from types import TracebackType
 
@@ -333,7 +334,7 @@ def get_binary_stream(name: t.Literal["stdin", "stdout", "stderr"]) -> t.BinaryI
     """
     opener = binary_streams.get(name)
     if opener is None:
-        raise TypeError(f"Unknown standard stream '{name}'")
+        raise TypeError(_("Unknown standard stream '{name}'").format(name=name))
     return opener()
 
 
@@ -354,7 +355,7 @@ def get_text_stream(
     """
     opener = text_streams.get(name)
     if opener is None:
-        raise TypeError(f"Unknown standard stream '{name}'")
+        raise TypeError(_("Unknown standard stream '{name}'").format(name=name))
     return opener(encoding, errors)