Fix graph description and text

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/projects/graphs/ci/_builds.haml

@@ -17,13 +17,13 @@
 
 .prepend-top-default
   %p.light
-    Builds chart for last month
+    Builds for last month
     (#{date_from_to(Date.today - 30.days, Date.today)})
   %canvas#monthChart{height: 200}
 
 .prepend-top-default
   %p.light
-    Builds chart for last year
+    Builds for last year
   %canvas#yearChart.padded{height: 250}
 
 - [:week, :month, :year].each do |scope|

features/steps/project/graph.rb

@@ -25,9 +25,9 @@ class Spinach::Features::ProjectGraph < Spinach::FeatureSteps
 
   step 'page should have CI graphs' do
     expect(page).to have_content 'Overall'
-    expect(page).to have_content 'Builds chart for last week'
-    expect(page).to have_content 'Builds chart for last month'
-    expect(page).to have_content 'Builds chart for last year'
+    expect(page).to have_content 'Builds for last week'
+    expect(page).to have_content 'Builds for last month'
+    expect(page).to have_content 'Builds for last year'
     expect(page).to have_content 'Commit duration in minutes for last 30 commits'
   end