Merge branch 'themes-accent' into shigusegubu

* themes-accent: (83 commits)
  fix and update changelog
  fix/remove contrast ratios
  removed base16-related code
  fix warning stylings
  fixed eslint, made `mod` work properly depending on context including in shadows
  Better Disabled buttons support. Mammal theme fixes. Implemented proper context-aware `mod` argument - now checks lightness of "variant" color. needs retesting tho
  updated preview to account for underlay
  update button toggled state, apply it to emoji reactions
  removed one color TODO
  add theme to list
  Kenomo (see: #624) theme. Ability to define link color for post contents. Fixes
  fix rgba function, whoops
  lint
  fix rgba css generation, add some tests to automatically verify that themes are generated properly
  fix transparent color not affecting downstream slots
  fix icons in menus
  improved selectedMenu again
  popover/selected menu improvements
  separate actual theme data from theme framework
  revert fgText -> text after some consideration. case was fixed already in other way
  ...

src/i18n/en.json

@@ -52,6 +52,7 @@
     "optional": "optional",
     "show_more": "Show more",
     "show_less": "Show less",
+    "dismiss": "Dismiss",
     "cancel": "Cancel",
     "disable": "Disable",
     "enable": "Enable",
@@ -281,6 +282,7 @@
     "follow_import": "Follow import",
     "follow_import_error": "Error importing followers",
     "follows_imported": "Follows imported! Processing them will take a while.",
+    "accent": "Accent",
     "foreground": "Foreground",
     "general": "General",
     "hide_attachments_in_convo": "Hide attachments in conversations",
@@ -406,7 +408,24 @@
         "save_load_hint": "\"Keep\" options preserve currently set options when selecting or loading themes, it also stores said options when exporting a theme. When all checkboxes unset, exporting theme will save everything.",
         "reset": "Reset",
         "clear_all": "Clear all",
-        "clear_opacity": "Clear opacity"
+        "clear_opacity": "Clear opacity",
+        "load_theme": "Load theme",
+        "keep_as_is": "Keep as is",
+        "use_snapshot": "Old version",
+        "use_source": "New version",
+        "help": {
+          "upgraded_from_v2": "PleromaFE has been upgraded, theme could look a little bit different than you remember.",
+          "v2_imported": "File you imported was made for older FE. We try to maximize compatibility but there still could be inconsitencies.",
+          "future_version_imported": "File you imported was made in newer version of FE.",
+          "older_version_imported": "File you imported was made in older version of FE.",
+          "snapshot_present": "Theme snapshot is loaded, so all values are overriden. You can load theme's actual data instead.",
+          "snapshot_missing": "No theme snapshot was in the file so it could look different than originally envisioned.",
+          "fe_upgraded": "PleromaFE's theme engine upgraded after version update.",
+          "fe_downgraded": "PleromaFE's version rolled back.",
+          "migration_snapshot_ok": "Just to be safe, theme snapshot loaded. You can try loading theme data.",
+          "migration_napshot_gone": "For whatever reason snapshot was missing, some stuff could look different than you remember.",
+          "snapshot_source_mismatch": "Versions conflict: most likely FE was rolled back and updated again, if you changed theme using older version of FE you most likely want to use old version, otherwise use new version."
+        }
       },
       "common": {
         "color": "Color",
@@ -435,14 +454,27 @@
         "alert": "Alert background",
         "alert_error": "Error",
         "alert_warning": "Warning",
+        "alert_neutral": "Neutral",
+        "post": "Posts/User bios",
         "badge": "Badge background",
+        "popover": "Tooltips, menus, popovers",
         "badge_notification": "Notification",
         "panel_header": "Panel header",
         "top_bar": "Top bar",
         "borders": "Borders",
         "buttons": "Buttons",
         "inputs": "Input fields",
-        "faint_text": "Faded text"
+        "faint_text": "Faded text",
+        "underlay": "Underlay",
+        "poll": "Poll graph",
+        "icons": "Icons",
+        "highlight": "Highlighted elements",
+        "pressed": "Pressed",
+        "selectedPost": "Selected post",
+        "selectedMenu": "Selected menu item",
+        "disabled": "Disabled",
+        "toggled": "Toggled",
+        "tabs": "Tabs"
       },
       "radii": {
         "_tab_label": "Roundness"
@@ -455,7 +487,7 @@
         "blur": "Blur",
         "spread": "Spread",
         "inset": "Inset",
-        "hint": "For shadows you can also use --variable as a color value to use CSS3 variables. Please note that setting opacity won't work in this case.",
+        "hintV3": "For shadows you can also use the {0} notation to use other color slot.",
         "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.",