Name the plugin capability config option consistently

The preset option was plugin_preference_overrides while the GUI field type
that renders it was GUIType::plugin_config, for one and the same thing.
Settle on "config": the store, the dialog and the Python hooks all say config
already, so renaming that way touches 4 files instead of the whole plugin
subsystem and the public plugin API.

Keep the _overrides suffix — the option is the preset's override layer over
the base PluginConfig store, a distinction EffectiveCapabilityConfig tracks.

Also wrap the printer tab's group heading in L(); it was the only one of the
three missing it, and was therefore untranslatable.

src/libslic3r/Preset.cpp

@@ -1203,7 +1203,7 @@ static std::vector<std::string> s_Preset_print_options{
     "post_process",
     "slicing_pipeline_plugin",
     "plugins",
-    "plugin_preference_overrides",
+    "plugin_config_overrides",
     "process_change_extrusion_role_gcode",
     "min_length_factor",
     "wall_maximum_resolution",
@@ -1378,7 +1378,7 @@ static std::vector<std::string> s_Preset_filament_options {/*"filament_colour",
     "filament_preheat_temperature_delta", "filament_retract_length_nc",
     "filament_change_length_nc", "filament_prime_volume_nc",
     "long_retractions_when_ec", "retraction_distances_when_ec",
-    "plugin_preference_overrides",
+    "plugin_config_overrides",
     //ams chamber
     "filament_dev_ams_drying_ams_limitations", "filament_dev_ams_drying_temperature", "filament_dev_ams_drying_time", "filament_dev_ams_drying_heat_distortion_temperature",
     "filament_dev_chamber_drying_bed_temperature", "filament_dev_chamber_drying_time",
@@ -1430,7 +1430,7 @@ static std::vector<std::string> s_Preset_printer_options {
     // Fast-purge printer flag + device/firmware-facing per-variant extruder-change
     // deretraction speed (unconsumed by the slicer; carried by H2D/A2L/X2D/P2S machine profiles).
     "support_fast_purge_mode", "deretract_speed_extruder_change",
-    "plugin_preference_overrides"
+    "plugin_config_overrides"
     };
 
 static std::vector<std::string> s_Preset_sla_print_options {

src/libslic3r/PrintConfig.cpp

@@ -1081,12 +1081,12 @@ void PrintConfigDef::init_common_params()
         def->set_default_value(new ConfigOptionString());
     }
 
-    def = this->add("plugin_preference_overrides", coString);
+    def = this->add("plugin_config_overrides", coString);
     def->label = L("Capabilities");
     def->tooltip = L("Configuration for the plugin capabilities this preset uses, overriding the global "
                      "Capabilities configuration. Stored as a raw JSON array and edited through the dialog "
                      "behind the button, never typed in directly.");
-    // Never shown as a text field: plugin_config renders a button that opens PluginsConfigDialog.
+    // Never shown as a text field: GUIType::plugin_config renders a button that opens PluginsConfigDialog.
     def->gui_type = ConfigOptionDef::GUIType::plugin_config;
     def->mode = comAdvanced;
     def->cli = ConfigOptionDef::nocli;

src/slic3r/GUI/Tab.cpp

@@ -3124,8 +3124,8 @@ void TabPrint::build()
 
         // Its own group: the one above hides its labels, and this row needs its label — and the revert
         // arrow beside it — to show. No label-width override either, as a 0 there means "no label column".
-        optgroup = page->new_optgroup(L("Plugin Preferences"), L"param_gcode");
-        optgroup->append_single_option_line("plugin_preference_overrides");
+        optgroup = page->new_optgroup(L("Plugin Configuration"), L"param_gcode");
+        optgroup->append_single_option_line("plugin_config_overrides");
 
         optgroup = page->new_optgroup(L("Notes"), "note", 0);
         option = optgroup->get_option("notes");
@@ -4528,8 +4528,8 @@ void TabFilament::build()
         option.opt.height = gcode_field_height;// 150;
         optgroup->append_single_option_line(option);
 
-        optgroup = page->new_optgroup(L("Plugin Preferences"), L"param_gcode");
-        optgroup->append_single_option_line("plugin_preference_overrides");
+        optgroup = page->new_optgroup(L("Plugin Configuration"), L"param_gcode");
+        optgroup->append_single_option_line("plugin_config_overrides");
 
     page = add_options_page(L("Multimaterial"), "custom-gcode_multi_material"); // ORCA: icon only visible on placeholders
         optgroup = page->new_optgroup(L("Wipe tower parameters"), "param_tower");
@@ -5037,8 +5037,8 @@ void TabPrinter::build_fff()
         // optgroup->append_single_option_line("spaghetti_detector");
         optgroup->append_single_option_line("time_cost", "printer_basic_information_advanced#time-cost");
 
-        optgroup = page->new_optgroup("Plugin Preferences", L"param_gcode");
-        optgroup->append_single_option_line("plugin_preference_overrides");
+        optgroup = page->new_optgroup(L("Plugin Configuration"), L"param_gcode");
+        optgroup->append_single_option_line("plugin_config_overrides");
 
         optgroup  = page->new_optgroup(L("Cooling Fan"), "param_cooling_fan");
         Line line = Line{ L("Fan speed-up time"), optgroup->get_option("fan_speedup_time").opt.tooltip };

src/slic3r/plugin/PluginConfig.hpp

@@ -44,7 +44,7 @@ private:
     std::vector<nlohmann::json>                  m_opaque_entries;
 };
 
-inline constexpr const char* PLUGIN_OVERRIDES_OPTION_KEY = "plugin_preference_overrides";
+inline constexpr const char* PLUGIN_OVERRIDES_OPTION_KEY = "plugin_config_overrides";
 
 std::string plugin_overrides_of(const Preset& preset);
 bool parse_plugin_overrides(const std::string& raw, CapabilityConfigDocument& document, std::string& error);