Remove font-weight: bold

In PG, a different font family (Roboto Medium) is used for bolding fonts
in the UI. This change removes this rule and replaces it where
necessary.

Change-Id: Ic3725a71614b06e568fa537b1adbbc788bb7c1f8

polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.html

@@ -56,7 +56,6 @@ limitations under the License.
         float: right;
       }
       .title {
-        font-weight: bold;
         min-width: 10em;
         padding: .75em .5em 0 var(--requirements-horizontal-padding);
         vertical-align: top;

polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.html

@@ -51,7 +51,6 @@ limitations under the License.
       }
       header gr-editable-label {
         font-size: var(--font-size-large);
-        font-weight: bold;
         --label-style: {
           text-overflow: initial;
           white-space: initial;

polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.html

@@ -29,12 +29,6 @@ limitations under the License.
   <template strip-whitespace>
     <style include="gr-voting-styles"></style>
     <style include="shared-styles">
-      .title {
-        font-weight: bold;
-        max-width: 20em;
-        padding-right: .5em;
-        word-break: break-word;
-      }
       .placeholder {
         color: var(--deemphasized-text-color);
         padding-top: .2em;

polygerrit-ui/app/styles/dashboard-header-styles.html

@@ -39,7 +39,7 @@ limitations under the License.
       }
       .info > div > span {
         display: inline-block;
-        font-weight: bold;
+        font-family: var(--font-family-bold);
         text-align: right;
         width: 4em;
       }