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===Parameters===
* '''key''' - Key string to localize.
* '''lang_code_override''' (OPTIONAL) - Overrides the current language to a specific language code.
* '''fallback_str''' (OPTIONAL) - Specifies behavior when a key is not found in the target language.
** Passing <code>en</code> causes it to return the English localization.
** Passing any other string causes it to return that string.
** Both of the above options have [[Template:MissingValveTranslationTooltip]] appended.
** Passing <code>dictionary</code> causes it to return a translation via [[Module:Dictionary]] without the tooltip.
** Use this often, as some keys are not yet localized in every language by the game. If parsing the fallback_str from Lua is computationally expensive, consider using the fallback outside this function so it only computes when needed.
* '''remove_var_index''' (OPTIONAL) - Removes %variables% from the resulting string. -1 also removes the character prefixing %variables%, while 1 removes the postfixed character, and 0 removes only the %variables%.
* '''item_name''' (OPTIONAL) - Required for strings containing <code>{s:variable}</code> placeholders. It will fetch the corresponding property from [[Module:ItemData]] to fill in the variable.

NOTE: When calling from wikitext via #invoke, parameters can be named. When calling from another Lua module, parameters must be passed in order (e.g., <code>p.get_string(key, nil, 'en')</code>).