Closes #2834

Merge request studip/studip!1918

Resolve "Barrierefreiheit: kontrastreiches Farbschema stellt Bilder und Smileys (in Blubber) schwarz dar."

Closes #2536

Merge request studip/studip!1863

Closes #2761

Merge request studip/studip!1909

Closes #2763 and #2764

Merge request studip/studip!1910

Closes #2811

Merge request studip/studip!1893

Closes #2830

Merge request studip/studip!1916

Closes #2831

Merge request studip/studip!1917

Closes #2527

Merge request studip/studip!1913

Closes #2590

Merge request studip/studip!1912

Merge request studip/studip!1906

Closes #2589

Merge request studip/studip!1892

Closes #2816

Merge request studip/studip!1898

Closes #2815

Merge request studip/studip!1897

Closes #2814

Merge request studip/studip!1896

Closes #2809

Merge request studip/studip!1891

Closes #2803

Merge request studip/studip!1890

Closes #2784

Merge request studip/studip!1882

Closes #1134

Merge request studip/studip!1886

Closes #2752

Merge request studip/studip!1865

Closes #2618

Merge request studip/studip!1810

Closes #2354

Merge request studip/studip!1835

Closes #1866

Merge request studip/studip!1837

Closes #2756

Merge request studip/studip!1866

Closes #2556

Merge request studip/studip!1875

Closes #2770

Merge request studip/studip!1879

Closes #2765

Merge request studip/studip!1881

Closes #2114

Merge request studip/studip!1876

Closes #2771

Merge request studip/studip!1880

Closes #2755

Merge request studip/studip!1864

Closes #2786

Merge request studip/studip!1883

Closes #2789

Merge request studip/studip!1885

Closes #2788

Merge request studip/studip!1884

Closes #2749

Merge request studip/studip!1862

Closes #2747

Merge request studip/studip!1861

Merge request studip/studip!1860

Closes #2741

Merge request studip/studip!1857

Closes #2734

Merge request studip/studip!1854