Prepared new release, v0.15.0 (#2547)

* bump version number

* update docs, citation, citation template

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* removed dependabot from contributor list

* generated changelog, second pass

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* generated changelog, third pass

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* generated changelog, fourth pass

* regenerated changelog, fifth pass

* fixed minor issues in generated changelog

* updated translations

* added one final PR to the release

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: behackl

CITATION.cff

@@ -4,10 +4,10 @@ authors:
   -
     name: "The Manim Community Developers"
 cff-version: "1.2.0"
-date-released: 2022-01-07
+date-released: 2022-02-26
 license: MIT
 message: "We acknowledge the importance of good software to support research, and we note that research becomes more valuable when it is communicated effectively. To demonstrate the value of Manim, we ask that you cite Manim in your work."
 title: Manim – Mathematical Animation Framework
 url: "https://www.manim.community/"
-version: "v0.14.0"
+version: "v0.15.0"
 ...