Fix typos, improve, update at main-page files and .github files (#5588)

* Update keywords; remove version cuz it changes constantly?

* Update if necessary

* Fix typos and links

* version_range_max from PyTorch's setup.py; fix typos; 1 checklist is enough?

* Fix a typo

* Fix typos

* There is already a Blank issue link at the bottom of the page; direct to Diffusers' forum

* Add 🌐 Translating a New Language? page

* Update .github/ISSUE_TEMPLATE/translate.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update PHILOSOPHY.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update PHILOSOPHY.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update PHILOSOPHY.md

* Update PHILOSOPHY.md

* Update CONTRIBUTING.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update PHILOSOPHY.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update PHILOSOPHY.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Update README.md

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* Add X account link

* Update setup.py

* Update CITATION.cff

---------

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

CITATION.cff

@@ -31,10 +31,12 @@ keywords:
   - deep-learning
   - pytorch
   - image-generation
+  - hacktoberfest
   - diffusion
   - text2image
   - image2image
   - score-based-generative-modeling
   - stable-diffusion
+  - stable-diffusion-diffusers
 license: Apache-2.0
 version: 0.12.1