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* Confugure Plugin Manager to use localised strings
* Add localisation strings for plugin manager

This should make it easier to help people troubleshoot networked setups.
Consider telling people to try connecting to the address with a web browser on the client's machine.

Original commits:

* Updated instructions

* 更新说明

* 更新说明

* 更新说明

* 更新说明

* 更新说明

* Updated instructions

* Updated instructions

Original commits:

* create `SetConstCommand` class and translations

* (partially) functional `setconst` command

* fixed punctuation

* added success message

* implemented `SetConstCommand`

* added translation keys

* update keys

* refactor + automatic reload

* Nitpick (Co-authored-by: AnimeGitB <AnimeGitB@bigblueball.in>)

Just realized that some commits have changed the language files to add some new things, so this is the Spanish translation of those... things.

Original commits:

* Fix some typos and fixes from original Readme

* Fix some typos

By: `Blue#7596` or `<@470933959929364481>`