amélioration des instructions pour la saisie des unités

Pour rendre les instructions plus visibles, ce serait bien d'afficher les instructions sans avoir à cliquer sur "show details et il faudrait modifier le texte qui apparait comme suit pour améliorer la compréhension des règles de saisie :

Only UCUM code can be used in the text field.

To choose a prefix, click on "Show prefix code" e.g. prefix for "micro" is u

To display the existing codes, click on "Show units code" e.g. code for "degree Celsius" is Cel

Exponents are written directly as numbers following the unit: e.g. m2 for square meter, m3 for cubic meter

Care must also be taken to combine units correctly: e.g. m/s or m.s-1 are valid entries.

If there is no entry in the field "unit", then the value is typed as a string of characters (qualitative value).

For numeric values that have no unit or dimensionless numbers, use an annotation between curly braces (e.g. {dimensionless} or {one}). This entry will be interpreted as a vector of dimension 1.

If you want to add any details, you can annotate your unit with curly braces { }, e.g. kg{total} --> kg(total) will be displayed in the field "unit"

Also, please use curly braces if your unit is not a valid SI unit, or if you do not wish any conversion.There must be no spaces in the content entered between curly braces.