Dev: #10287: Expression are hardest to find in 2.5 than in 2.06

Dev: just reapply the same color
Dev: removed strong from default
Dev: removed updated color from theme : there are a background for expression
Dev: color are oldy ... maybe renew it ? ANd find a backfground for Dark or Clear theme

styles/expressions.css

@@ -1,10 +1,12 @@
-
+/* See https://manual.limesurvey.org/Expression_Manager#Syntax_Highlighting for color,  */
+.em-expression{background:#eee8aa ;display:inline-block;border:1px dotted #ccc}
 .em-haveerror{border-color: #ff4500}
-
-.em-var-static,a.em-var-static{color:#a0522d /* sienna */}/* Static */
-.em-var-before,a.em-var-before{color:#9370db /* mediumpurple*/ }/* Var used before set */
-.em-var-after,a.em-var-after{color:#008000 /* green */}/* Var used after - no js except for survey */
-.em-var-inpage,a.em-var-inpage{color:#4169e1 /* royalblue */} /* Javascript used in survey or group mode*/
-.em-var-error,a.em-var-error{color: #ff0000 /* red */}
-.em-assign{color: #ff4500 /* orangered */}
-.em-error{border: 2px solid #ff0000; /* red */;}
+.em-function{color: #0000ff}
+.em-var-string{color: #808080}
+.em-var-static,a.em-var-static{color:#a0522d}/* Static */
+.em-var-before,a.em-var-before{color:#9370db}/* Var used before set */
+.em-var-after,a.em-var-after{color:#008000}/* Var used after - no js except for survey */
+.em-var-inpage,a.em-var-inpage{color:#4169e1} /* Javascript used in survey or group mode*/
+.em-var-error,a.em-var-error{color: #ff0000;font-weight:700} /* Maybe font-weight:400 */
+.em-assign{color: #ff4500}
+.em-error{border: 2px solid #ff0000}