Add mod documentation in seven languages

locale/collection_settings_en.properties

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+# Collection parameter editor
+mod_manager/game_settings_title = Game parameters
+mod_manager/game_settings_hint = Configure this collection. After Apply, click Save; changes take effect on the next game launch.
+mod_manager/game_settings_automatic = Automatic
+mod_manager/game_settings_custom = Custom value
+mod_manager/game_settings_unavailable = unavailable
+mod_manager/game_settings_missing = This choice is unavailable in this collection. The saved value is preserved.
+mod_manager/game_settings_owner_missing = The mod using this parameter is not included in the collection. Its value will be preserved.
+mod_manager/game_settings_invalid = Check the format of the entered value.
+mod_manager/game_settings_single_choice = Without an explicit value, the engine uses the only available choice. Select one if several are available.
+mod_manager/game_settings_browse = Browse…
+mod_manager/game_settings_choose = Choose
+mod_manager/game_settings_search_hint = Search by name or ID
+mod_manager/game_settings_advanced = Additional parameters
+mod_manager/game_settings_advanced_hint = Parameters from mods without form declarations. Edit keys and values; deleting a row removes the parameter.
+mod_manager/game_settings_add = Add parameter
+mod_manager/game_settings_key = Parameter key
+mod_manager/game_settings_value = Value
+mod_manager/game_settings_remove = Remove
+mod_manager/game_settings_remove_hint = Remove this parameter from the collection on Apply
+mod_manager/game_settings_duplicate = Keys must be nonempty and unique.
+mod_manager/game_settings_metadata_error = Could not read parameter declarations from mods:
+mod_manager/hint_game_settings_title = Game parameters
+mod_manager/hint_game_settings_body = Configure this collection. After Apply, click Save; changes take effect on the next game launch.