I18n: cleanup for Admin English/Spanish strings

* Add missing exclamation marks
* Fix typos
* Remove duplicated keys
* Remove trailing whitespaces
* Replace single quotes with double quotes
* Replace untranslated strings
* Fix incorrect 'Spending proposal' assertion

config/locales/en/admin.yml

@@ -41,7 +41,7 @@ en:
         form:
           error:
             one: "error prevented this banner from being saved"
-            other: 'errors prevented this banner from being saved'
+            other: "errors prevented this banner from being saved"
       new:
         creating: Create banner
     activity:
@@ -62,7 +62,7 @@ en:
           on_users: Users
         title: Moderator activity
         type: Type
-        no_activity: There ares no moderators activity.
+        no_activity: There are no moderators activity.
     budgets:
       index:
         title: Participatory budgets
@@ -664,7 +664,7 @@ en:
         search_officer_placeholder: Search officer
         search_officer_text: Search for an officer to assign a new shift
         select_date: "Select day"
-        no_voting_days: "Los dias de votación terminaron"
+        no_voting_days: "Voting days ended"
         select_task: "Select task"
         table_shift: "Shift"
         table_email: "Email"

config/locales/es/admin.yml

@@ -41,7 +41,7 @@ es:
         form:
           error:
             one: "error impidió guardar el banner"
-            other: 'errores impidieron guardar el banner.'
+            other: "errores impidieron guardar el banner"
       new:
         creating: Crear banner
     activity:
@@ -257,7 +257,7 @@ es:
       edit:
         title: Editar hito
       create:
-        notice: Nuevo hito creado con éxito!
+        notice: ¡Nuevo hito creado con éxito!
       update:
         notice: Hito actualizado
       delete:

spec/models/signature_sheet_spec.rb

@@ -51,7 +51,7 @@ describe SignatureSheet do
       spending_proposal = create(:spending_proposal)
       signature_sheet.signable = spending_proposal
 
-      expect(signature_sheet.name).to eq("Spending proposal #{spending_proposal.id}")
+      expect(signature_sheet.name).to eq("Investment project #{spending_proposal.id}")
     end
 
     it "returns name for budget investment signature sheets" do