Merge branch 'shadow-control-2.0' into 'develop'

Fixed and refined the shadow control in theme tab

See merge request pleroma/pleroma-fe!1939

src/i18n/en.json

@@ -874,6 +874,9 @@
         "component": "Component",
         "override": "Override",
         "shadow_id": "Shadow #{value}",
+        "offset": "Shadow offset",
+        "light_grid": "Use light checkerboard",
+        "name": "Name",
         "blur": "Blur",
         "spread": "Spread",
         "inset": "Inset",
@@ -881,6 +884,7 @@
         "filter_hint": {
           "always_drop_shadow": "Warning, this shadow always uses {0} when browser supports it.",
           "drop_shadow_syntax": "{0} does not support {1} parameter and {2} keyword.",
+          "avatar_inset_short": "Separate inset shadow",
           "avatar_inset": "Please note that combining both inset and non-inset shadows on avatars might give unexpected results with transparent avatars.",
           "spread_zero": "Shadows with spread > 0 will appear as if it was set to zero",
           "inset_classic": "Inset shadows will be using {0}"