Clarification for blackbox logging rate and some localization cleanup

_locales/en/messages.json

@@ -1783,6 +1783,21 @@
     },
       "configurationVesselName": {
         "message": "Craft name"
+    },
+      "onboardLoggingBlackbox": {
+    	"message": "Blackbox logging device"
+    },
+      "onboardLoggingRateOfLogging": {
+    	"message": "Portion of PID loop iterations to log (logging rate)"  
+    },
+      "onboardLoggingSerialLogger": {
+    	"message": "Outboard serial logging device"  
+    },
+      "onboardLoggingFlashLogger": {
+    	"message": "Onboard dataflash chip"  
+    },
+      "onboardLoggingEraseInProgress": {
+    	"message": "Erase in progress, please wait..."  
     }
     
     
@@ -1790,4 +1805,7 @@
     
     
 
+
+
+
 }

tabs/onboard_logging.html

@@ -23,12 +23,12 @@
                     <div class="line blackboxDevice">
                         <select name="blackbox_device">
                         </select>
-                        <span>Blackbox logging device</span>
+                        <span i18n="onboardLoggingBlackbox"></span>
                     </div>
                     <div class="line blackboxRate">
                         <select name="blackbox_rate">
                         </select>
-                        <span>Portion of flight loop iterations to log (logging rate)</span>
+                        <span i18n="onboardLoggingRateOfLogging"></span>
                     </div>
                     <div class="line">
                         <a href="#" class="save-settings regular-button" i18n="blackboxButtonSave"></a>
@@ -38,8 +38,7 @@
             
             <div class="gui_box grey">
                 <div class="gui_box_titlebar" align="left">
-                    <div class="spacer_box_title">
-                        Outboard serial logging device
+                    <div class="spacer_box_title" i18n="onboardLoggingSerialLogger">
                     </div>
                 </div>
                 <div class="spacer_box">
@@ -49,8 +48,7 @@
             
             <div class="gui_box grey require-dataflash-supported">
                 <div class="gui_box_titlebar" align="left">
-                    <div class="spacer_box_title">
-                        Onboard dataflash chip
+                    <div class="spacer_box_title" i18n="onboardLoggingFlashLogger">
                     </div>
                 </div>
                 <div class="spacer_box">
@@ -62,7 +60,7 @@
                             <div class="dataflash-confirm-erase-note" i18n="dataflashConfirmEraseNote"></div>
                             <div class="dataflash-erase-progress">
                                 <div class="data-loading">
-                                    <p>Erase in progress, please wait...</p>
+                                    <p i18n="onboardLoggingEraseInProgress"></p>
                                 </div>
                             </div>
                             <div class="buttons">