[FIX] *: correct English terms

Some bad phrasing
Courtesy of Cecile Collart

closes odoo/odoo#48233

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/hr_recruitment_survey/data/survey_demo.xml

@@ -39,7 +39,7 @@
     <record id="survey_recruitment_form_p1_q3" model="survey.question">
         <field name="survey_id" ref="survey_recruitment_form"/>
         <field name="sequence">4</field>
-        <field name="title">Did you apply from an employee ?</field>
+        <field name="title">Were you referred by an employee?</field>
         <field name="question_type">char_box</field>
     </record>
 

addons/website_forum/views/website_forum.xml

@@ -724,7 +724,7 @@
                     <div t-elif="my == 'mine'" class="alert border">You have no questions in this forum (yet).</div>
                 </t>
 
-                <div t-elif="filters == 'unanswered'" class="alert alert-info">Amazing! There are not answered questions!</div>
+                <div t-elif="filters == 'unanswered'" class="alert alert-info">Amazing! There are no unanswered questions left!</div>
                 <div t-elif="no_filters and not search and not tag and not my" class="alert alert-info">
                     <b>This forum is empty.</b><br/>
                     Be the first one asking a question

addons/website_slides/data/slide_slide_demo.xml

@@ -653,7 +653,7 @@
         <field name="is_preview" eval="False"/>
         <field name="public_views">0</field>
         <field name="completion_time">3</field>
-        <field name="description">Learn of to identify quality wood in order to create solid furnitures.</field>
+        <field name="description">Learn to identify quality wood in order to create solid furnitures.</field>
     </record>
      <record id="slide_slide_demo_5_2" model="slide.slide">
         <field name="name">How to create your own piece of furniture</field>

addons/website_slides_survey/data/survey_demo.xml

@@ -85,7 +85,7 @@
         <record model="survey.question.answer" id="furniture_certification_page_1_question_2_choice_4">
             <field name="question_id" ref="furniture_certification_page_1_question_2"/>
             <field name="sequence">4</field>
-            <field name="value">Shelve</field>
+            <field name="value">Shelf</field>
             <field name="is_correct" eval="True" />
             <field name="answer_score">1.0</field>
         </record>