Add decryption keys import in account settings

src/icons/dark-filled/export-keys.svg

@@ -0,0 +1 @@
+<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd" clip-rule="evenodd"><path d="M9 16h-8v6h22v-6h-8v-1h9v8h-24v-8h9v1zm11 2c.552 0 1 .448 1 1s-.448 1-1 1-1-.448-1-1 .448-1 1-1zm-7.5 0h-1v-14.883l-4.735 5.732-.765-.644 6.021-7.205 5.979 7.195-.764.645-4.736-5.724v14.884z"/></svg>

src/icons/dark-filled/import-keys.svg

@@ -0,0 +1 @@
+<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd" clip-rule="evenodd"><path d="M6 16h-5v6h22v-6h-5v-1h6v8h-24v-8h6v1zm14 2c.552 0 1 .448 1 1s-.448 1-1 1-1-.448-1-1 .448-1 1-1zm-7.5-17v14.884l4.736-5.724.764.645-5.979 7.195-6.021-7.205.765-.644 4.735 5.732v-14.883h1z"/></svg>

src/icons/light-thin/export-keys.svg

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   id="svg4"
+   version="1.1"
+   clip-rule="evenodd"
+   fill-rule="evenodd"
+   height="24"
+   width="24">
+  <metadata
+     id="metadata10">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs8" />
+  <path
+     style="fill:#c8c8c8;fill-opacity:1"
+     id="path2"
+     d="M9 16h-8v6h22v-6h-8v-1h9v8h-24v-8h9v1zm11 2c.552 0 1 .448 1 1s-.448 1-1 1-1-.448-1-1 .448-1 1-1zm-7.5 0h-1v-14.883l-4.735 5.732-.765-.644 6.021-7.205 5.979 7.195-.764.645-4.736-5.724v14.884z" />
+</svg>

src/icons/light-thin/import-keys.svg

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   id="svg4"
+   version="1.1"
+   clip-rule="evenodd"
+   fill-rule="evenodd"
+   height="24"
+   width="24">
+  <metadata
+     id="metadata10">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs8" />
+  <path
+     style="fill:#c8c8c8;fill-opacity:1"
+     id="path2"
+     d="M6 16h-5v6h22v-6h-5v-1h6v8h-24v-8h6v1zm14 2c.552 0 1 .448 1 1s-.448 1-1 1-1-.448-1-1 .448-1 1-1zm-7.5-17v14.884l4.736-5.724.764.645-5.979 7.195-6.021-7.205.765-.644 4.735 5.732v-14.883h1z" />
+</svg>