[stylesheets] repaired some elements fonts color

apps/common/main/resources/less/buttons.less

@@ -45,6 +45,10 @@
         outline-offset: 0;
     }
 
+    &:hover {
+        color: @text-normal;
+    }
+
     &:active, &.active {
         -webkit-box-shadow: none;
         box-shadow: none;

apps/common/main/resources/less/common.less

@@ -37,3 +37,9 @@ label {
 .user-select {
     .user-select(text);
 }
+
+.dropdown-menu {
+    > li > a {
+        color: @text-normal;
+    }
+}

apps/documenteditor/main/resources/less/filemenu.less

@@ -27,7 +27,7 @@
           background-color: var(--highlight-button-pressed);
 
           > a {
-            color: var(--text-inverse);
+            color: @text-inverse;
           }
         }