Fix golangci-lint configuration

- remove redundante whitespace
- rename wrong linter-settings to linters-settings
- ignore strconv functions for gomnd linter
- use australian locale for spell checking

.golangci.yml

@@ -2,16 +2,16 @@
 run:
   skip-files:
     - boardvoting/assets.go
- 
+
 output:
   sort-results: true
 
-linter-settings:
+linters-settings:
   goheader:
     values:
       const:
         ORGANIZATION: CAcert Inc.
-    template: |
+    template: |-
       Copyright {{ YEAR-RANGE }} {{ ORGANIZATION }}
       SPDX-License-Identifier: Apache-2.0
 
@@ -26,10 +26,13 @@ linter-settings:
       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       See the License for the specific language governing permissions and
       limitations under the License.
+  gomnd:
+    ignore-functions:
+      - 'strconv.*'
   goimports:
     local-prefixes: git.cacert.org/cacert-boardvoting
   misspell:
-    locale: US
+    locale: en-AU
     ignore-words:
       - CAcert