Client - init "About" page and admin contact in footer

+  add missing translations

fittrackee_client/src/locales/en/about.json

@@ -0,0 +1,6 @@
+{
+  "CONTACT_ADMIN": "Contact the administrator",
+  "FITTRACKEE_DESCRIPTION": "<strong>FitTrackee</strong> is a self-hosted outdoor activity tracker.",
+  "FITTRACKEE_LICENSE": "under {0} license ",
+  "SOURCE_CODE": "Source code"
+}

fittrackee_client/src/locales/en/administration.json

@@ -7,9 +7,11 @@
   "ADMINISTRATION": "Administration",
   "APPLICATION": "Application",
   "APP_CONFIG": {
+    "ADMIN_CONTACT": "Administrator email for contact",
     "MAX_USERS_LABEL": "Max. number of active users",
     "MAX_USERS_HELP": "If 0, no limitation on registration.",
     "MAX_FILES_IN_ZIP_LABEL": "Max. files of zip archive",
+    "NO_CONTACT_EMAIL": "no contact email",
     "SINGLE_UPLOAD_MAX_SIZE_LABEL": "Max. size of uploaded files (in Mb)",
     "TITLE": "Application configuration",
     "ZIP_UPLOAD_MAX_SIZE_LABEL": "Max. size of zip archive (in Mb)"

fittrackee_client/src/locales/en/api.json

@@ -23,6 +23,7 @@
     "signature expired, please log in again": "Signature expired. Please log in again.",
     "successfully registered": "Successfully registered.",
     "user does not exist": "User does not exist.",
+    "valid email must be provided for admin contact": "A valid email must be provided for admininstrator contact",
     "you can not delete your account, no other user has admin rights": "You can not delete your account, no other user has admin rights.",
     "you do not have permissions": "You do not have permissions."
   },

fittrackee_client/src/locales/en/common.json

@@ -1,6 +1,9 @@
 {
+  "ABOUT": "about",
   "CONFIRMATION": "Confirmation",
+  "CONTACT": "contact",
   "DAY": "day | days",
+  "DOCUMENTATION": "documentation",
   "HOME": "Home",
   "HERE": "here",
   "SELECTS": {

fittrackee_client/src/locales/en/en.ts

@@ -1,3 +1,4 @@
+import AboutTranslations from './about.json'
 import AdministrationTranslations from './administration.json'
 import ApiTranslations from './api.json'
 import ButtonsTranslations from './buttons.json'
@@ -10,6 +11,7 @@ import UserTranslations from './user.json'
 import WorkoutsTranslations from './workouts.json'
 
 export default {
+  about: AboutTranslations,
   admin: AdministrationTranslations,
   api: ApiTranslations,
   buttons: ButtonsTranslations,